Installation and Maintenance Manual
IM 1058-6
Group: Applied Air Systems
Part Number: IM 1058
Date: June 2015
Maverick® II
Commercial Packaged Rooftop Systems
Heating and Cooling
Models MPS015F – 0050F
15 to 50 Tons
R-410A Refrigerant
MicroTech® III Unit Controller
Energy Recovery Wheel
Table of Contents
Table of Contents
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Duct High Pressure Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Unit Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Convenience Receptacle (Field Powered) . . . . . . . . . . . . . . . . . . . 49
Hazard Identification Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Convenience Receptacle (Unit Powered) . . . . . . . . . . . . . . . . . . . 49
Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Condenser Fan Operation for Variable Speed Compressor
Low Ambient Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Installer Responsibilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
VFD Compressor Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Receiving Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Service Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Ventilation Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Overhead Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Variable Speed Scroll Compressor . . . . . . . . . . . . . . . . . . . . . . . . . 56
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Operating States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Roof Curb Assembly and Installation . . . . . . . . . . . . . . . . . . . . . . . . 5
Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Rigging and Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mechanical Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Check, Test, and Start Procedures . . . . . . . . . . . . . . . . . . . . . . . . . 87
Pre-Start of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Condensate Drain Pipe Connection . . . . . . . . . . . . . . . . . . . . . . . . 15
Servicing Control Panel Components . . . . . . . . . . . . . . . . . . . . . . 87
Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Cabinet Weather Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Installing Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Field Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Energy Recovery Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Final Control Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Controller Settings for Normal Operation . . . . . . . . . . . . . . . . . . . . 92
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Performing Service Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Control Panel Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Preparing Unit for Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Unit Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Spring Isolated Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Bearing Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Optional Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Energy Recovery Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Gas Furnace Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Segment Installation & Replacement . . . . . . . . . . . . . . . . . . . . . . 103
Optional Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Wheel Drive Motor & Pulley Replacement . . . . . . . . . . . . . . . . . . 103
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Belt Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Optional Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Start-Up Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Supply Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Optional Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Electric Heater Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Optional Modulating Hot Gas Reheat . . . . . . . . . . . . . . . . . . . . . . . 33
Modulating Hot Gas Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Servicing Optional Electric Heater . . . . . . . . . . . . . . . . . . . . . . . . 105
Service and Warranty Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 106
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Optional Modulating Hot Gas Reheat . . . . . . . . . . . . . . . . . . . . . . . 34
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Optional Hot Water Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Hot Water Heater Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Optional Energy Recovery Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Energy Recovery Wheel Design . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Optional Outdoor Air Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
In-Warranty Return Material Procedure . . . . . . . . . . . . . . . . . . . . 106
Warranty Registration Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Quality Assurance Survey Report
. . . . . . . . . . . . . . . . . . . . . . 113
Appendix – Keypad/Display Menu Structure . . . . . . . . . . . . . . . . 114
Thermal Dispersion Airflow Measurement Technology . . . . . . . . . . 42
Unit Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Economizer Enthalpy Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
External Time Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Exhaust Fan Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Proof-of-Airflow and Dirty Filter Switch . . . . . . . . . . . . . . . . . . . . . . 48
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
2
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General Information
General Information
This manual provides general information about the “F”
vintage Daikin Commercial Packaged Rooftop Unit model
MPS. In addition to an overall description of the unit, it
includes mechanical and electrical installation procedures,
commissioning procedures, sequence of operation information,
and maintenance instructions.
Unit Nameplate
The MicroTech® III rooftop unit controller is available on
“F” vintage rooftop units. For a detailed description of the
MicroTech III components, input/output configurations, field
wiring options and requirements, and service procedures,
see OM 920. For operation and information on using and
programming the MicroTech III unit controller, refer to the
appropriate operation manual (see Table 1).
Hazard Identification Information
DANGER
Dangers indicate a hazardous situation which will result in
death or serious injury if not avoided.
For a description of operation and information on using
the keypad to view data and set parameters, refer to the
appropriate program-specific operation manual (see Table 1).
WARNING
Warnings indicate potentially hazardous situations, which can
result in property damage, severe personal injury, or death if
not avoided.
Table 1: Program Specific Unit Operation Literature
Rooftop unit control configuration
Manual bulletin number
VFDs
OM 844 - MD2
OM 895 - MD3
OM 1190 - MD4
OM 1191 - MD5
OM 847 - MD6
MPS Unit Controller
Discharge Air Control (VAV or CAV)
Space Comfort Control (SCC)
OM 920
LonWorks Integration
IM 918
BACnet Integration
IM 917
BACnet IP Comm Module
IM 916
The unit nameplate is located on the outside of the main
control box door. It includes the unit model number, serial
number, electrical characteristics, and refrigerant charge.
CAUTION
Cautions indicate potentially hazardous situations, which can
result in personal injury or equipment damage if not avoided.
Nomenclature (MPS 015–050)
M P S – 015 – F G
Daikin Packaged System
Heat medium
Y = None (cooling only)
G = Natural gas
E = Electric heat
W = Hot water heat
Nominal capacity (tons)
Design vintage
• 15F
• 20/26G
• 30–50 F
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Mechanical Installation
Mechanical Installation
Installer Responsibilities
Receiving Inspection
The installation of this equipment shall be in accordance
with the regulations of authorities having jurisdiction and all
applicable codes. It is the responsibility of the installer to
determine and follow the applicable codes.
When the equipment is received, all items should be carefully
checked against the bill of lading to be sure all crates and
cartons have been received. If the unit has become dirty
during shipment (winter road chemicals are of particular
concern), clean it when received.
CAUTION
Sharp edges on sheet metal and fasteners can cause
personal injury. This equipment must be installed, operated,
and serviced only by an experienced installation company and
fully trained personnel.
All units should be carefully inspected for damage when
received. Report all shipping damage to the carrier and file a
claim. In most cases, equipment is shipped F.O.B. factory and
claims for freight damage should be filed by the consignee.
Before unloading the unit, check the unit nameplate to make
sure the voltage complies with the power supply available.
Service Clearance
Allow service clearances as approximately indicated in Figure
1. Also, Daikin recommends providing a roof walkway to the
rooftop unit as well as along each side of the unit that provides
access to most controls and serviceable components.
Figure 1: Service Clearances
Evaporator/
Hot Gas Reheat Coil
* 61-75 Ton
Fan and Gas/Electric/Hot Water
Heaters can be removed from
either side
Optional
Energy Recovery Wheel (ERW)
Assembly
Fan
Assembly
(removal from
this side only)
15-50 Ton
Optional Hot
Water Heat
(removal from
this side only*)
B
60.00
(1524 mm)
A
60.00
(1524 mm)
96.00
(2438 mm)
Optional
Energy Recovery Wheel
Exhaust Air Fan Assembly
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Gas Furnace
or Electric Heat
15-50 Ton
A = 72 (1828 mm)
B = 60 (1524 mm)
4
61-75 Ton
60 (1524 mm)
72 (1828 mm)
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Mechanical Installation
Ventilation Clearance
Overhead Clearance
Below are minimum ventilation clearance recommendations.
The system designer must consider each application and
provide adequate ventilation. If this is not done, the unit may
not perform properly.
1. Unit(s) surrounded by screens or solid walls must have
no overhead obstructions over any part of the unit.
Unit(s) Surrounded by a Screen or a Fence:
3. The following restrictions must be observed for overhead
obstructions above the air handler section:
2. The area above the condenser must be unobstructed in
all installations to allow vertical air discharge.
1. The bottom of the screen or fence should be at least 1 ft.
(305 mm) above the roof surface.
2. The distance between the unit and a screen or fence
should be as described in Figure 1.
b. Overhead obstructions must be no less than 96"
(2438 mm) above the top of the unit.
3. The distance between any two units within a screen or
fence should be at least 120" (3048 mm).
Unit(s) Surrounded by Solid Walls:
1. If there are walls on one or two adjacent sides of the unit,
the walls may be any height. If there are walls on more
than two adjacent sides of the unit, the walls should not
be higher than the unit.
2. The distance between the unit and the wall should be at
least 96" (2438 mm) on all sides of the unit.
c. There must be no overhead obstructions in the
areas above the outside air and exhaust dampers
that are farther than 24" (610 mm) from the side of
the unit.
Roof Curb Assembly and
Installation
Locate the roof curb and unit on a portion of the roof that can
support the weight of the unit. The unit must be supported to
prevent bending or twisting of the machine.
3. The distance between any two units within the walls
should be at least 120" (3048 mm).
Do not locate outside air intakes near sources of
contaminated air.
If the unit is installed where windy conditions are common,
install wind screens around the unit, maintaining the
clearances specified (see Figure 1). This is particularly
important to maintain adequate head pressure control when
mechanical cooling is required at low outdoor air temperatures.
NOTE: Low head pressure may lead to poor and erratic
refrigerant feed control at the thermostatic expansion
valve. The unit has automatic control of the
condenser fans which should provide adequate head
pressure control down to 20°F provided the unit is not
exposed to windy conditions. The system designer is
responsible for assuring the condensing section is not
exposed to excessive wind or air recirculation.
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a. There must be no overhead obstructions above the
furnace flue, or within 9" (229 mm) of the flue box.
5
If building construction allows sound and vibration into the
occupied space, locate the unit over a non-critical area. It is
the responsibility of the system designer to make adequate
provisions for noise and vibration in the occupied space.
WARNING
Mold can cause personal injury. Some materials such as
gypsum wall board can promote mold growth when damp.
Such materials must be protected from moisture that can
enter units during maintenance or normal operation.
Install the curb and unit level to allow the condensate drain to
flow properly and allow service access doors to open and close
without binding.
The gasketed top surface of the curb seals against the unit
when it is set on the curb. These flanges must not support
the total weight of the duct work. See Installing Ductwork on
page 16 for details on duct connections. It is critical that
the condensate drain side of the unit be no higher than the
opposite side.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Mechanical Installation
Assembly Instructions
Assembly of a typical roof curb is shown in Figure 2.
1. Set curbing parts A thru G per dimensions shown over
roof opening or on a level surface. Note location of
supply air opening. Check alignment of all mating screw
holes.
4. Position curb assembly over roof openings. Curb must
be level within 0.25 inches from side to side and 1.50
inches over its length. Check that top surface of curb is
flat with no bowing or sagging.
2. Screw curbing parts together using fasteners provided.
Leave all screws loose until curb is checked to be square.
5. Weld curb assembly in place. Caulk all seams watertight.
Remove backing from 0.25 × 1.50 wide gasket and apply
to surfaces shown by crosshatching.
3. Square entire curbing assembly and securely tighten all
screws.
6. Check that electrical connections are coordinated.
Figure 2: Roof Curb Assembly (MPS 026G – 035F Example)
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
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Mechanical Installation
Figure 3: Roof Curb Layout—MPS 015F – 020G
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Mechanical Installation
Figure 4: Roof Curb Layout—MPS 026G – 035F
2.00
[51 mm]
23.50
[597 mm]
2.00
[51 mm]
21.25
[540 mm]
71.38
[1813 mm]
87.25
[2216 mm]
(INSIDE CURB)
HOT WATER
ONLY
CHASE
2.00
[51 mm]
1.25
[32 mm] TYP
63.69
[1610 mm]
15.87
[403 mm]
1.00
[25 mm]
1.63
[41 mm]
19.00
[483 mm]
93.70
[2380 mm]
171.18 (INSIDE CURB)
[4348 mm]
PLAN VIEW
2.00
[51 mm]
1.00
[26 mm]
1.00
[26 mm]
3.75
[95 mm]
0.38
[9.7 mm]
F
0.38
[9.7 mm]
2.00
[51 mm]
23.86
[606 mm]
KNOCKOUT DETAIL
CURB CROSS SECTION
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
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Mechanical Installation
Figure 5: Roof Curb Layout—MPS 040F – 050F
2.00
[51 mm]
30.63
[778 mm]
28.25
[718 mm]
2.00
[51 mm]
71.38
[1813 mm]
87.25
[2216 mm]
(INSIDE CURB)
HOT WATER
ONLY
CHASE
2.00
[51 mm]
1.25 TYP
[32 mm]
69.39
[1763 mm]
15.87
[403 mm]
1.00
[25 mm]
1.63
[41 mm]
26.00
[660 mm]
105.45
[2678 mm]
208.57 (INSIDE CURB)
[5298 mm]
PLAN VIEW
2.00
[51 mm]
1.00
[25 mm]
3.75
[95 mm]
2.00
[51 mm]
0.38
[9.7 mm]
F
0.38
[9.7 mm]
28.92
[735 mm]
CURB CROSS SECTION
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Mechanical Installation
Figure 6: MPS 015–020 Roof Curb with Energy Recovery Wheel
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
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Mechanical Installation
Figure 7: MPS 026–035 Roof Curb with Energy Recovery Wheel
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Mechanical Installation
Figure 8: MPS 040–050 Roof Curb with Energy Recovery Wheel
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
12
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Mechanical Installation
Rigging and Handling
WARNING
Only trained and qualified personnel should be allowed to rig
loads or operate load rated cranes and/or hoist assemblies.
Do not use a forklift to lift or maneuver the unit. Failure to use
a load rated crane or hoist assembly to lift or maneuver the
unit can cause severe personal injury and property damage.
Use spreader bars, 96" to 100" (2438 to 2540 mm) wide to
prevent damage to the unit cabinet. Avoid twisting or uneven
lifting of the unit. The cable length from the bracket to the hook
should always be longer than the distance between the outer
lifting points.
If the unit is stored at the construction site for an intermediate
period, take these additional precautions:
1. Support the unit well along the length of the base rail.
WARNING
Use all lifting points. Improper lifting can cause property
damage, severe pers al injury, or death.
CAUTION
Lifting points may not be symmetrical to the center of gravity
of the unit. Ballast or unequal cable lengths may be required.
Rigging holes for shackles are integral on the unit base. All
six lifting points must be used for rigging the equipment.
Use four independent lines, securing one end of a line
to a unit base lifting point and the other end of the line
to an associated spreader bar lifting point (see Figure 10
and Figure 11). Figure 9 is an example of an instruction label
shipped with each unit.
2. Level the unit (no twists or uneven ground surface).
3. Provide proper drainage around the unit to prevent
flooding of the equipment.
4. Provide adequate protection from vandalism, mechanical
contact, etc.
5. Securely close the doors.
6. Cover the supply and return air openings.
Table 4 and Table 5 lists the weight distribution at each of the
lifting points on the unit (refer to Figure 10 and Figure 11). Table
6 details lifting point locations. Table 7 through Table 12 lists the
weights of unit curbs and other sections of the unit.
Table 2: Unit Base Weights
Unit (Tons)
Total Weight (lbs)
015
2655
017
2705
020
3610
026
3610
030
3610
035
3660
040
4685
050
4985
Figure 9: Rigging Label
LIFT UNIT ONLY AS SHOWN
SPREADER BARS REQUIRED
Table 3: Unit Curb Weights
Unit (tons)
Curb Height (inches)
Total Weight (lbs)
Standard Unit
MUST USE ALL OF THESE
LIFTING LUGS FOR LIFTING UNIT.
015–035
040–050
14
341
24
504
14
461
24
706
Unit with Energy Wheel
015–035
040–050
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14
458
24
674
14
619
24
908
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Mechanical Installation
Table 4: Weight Distribution Locations (see Figure 10)
Table 5: Weight Distribution Locations (see Figure 11)
Distance
Distance
Unit
(tons)
L1
L2
L3
L4
Unit
(tons)
L1
L2
L3
040–050
42.2
66.6
58.3
60.9
015–035
35.5
62.0
52.0
040–050
40.0
69.0
89.0
Table 6: Weight Distribution — Energy Wheel
Point
Unit
Percent of total
A
B
C
D
E
F
G
H
015–050 without Energy Wheel
11%
11%
20%
24%
16%
18%
N/A
N/A
015–035 with Energy Wheel
13%
12%
20%
21%
17%
17%
N/A
N/A
040–050 with Energy Wheel
12%
12%
13%
13%
12%
12%
13%
13%
Table 7: Heat Section Weights
Unit
(tons)
Table 10: Additional Weights - Motors/Exhaust Fans
(015–020)
Weights (lbs)
High Gas
Heat
Low Gas
Heat
Electric
Heat
Hot Water
Heat
015
200
100
120
017
200
100
120
020
200
100
026
270
135
030
270
035
270
040
050
HP
Additional Motor
Weight (lbs)
Unit
(tons)
Additional Exhaust
Fan Weight (lbs)
195
1
0
15–20
150
195
1.5
9
120
195
2
9
270
291
3
32
135
270
291
5
43
135
270
291
350
175
350
307
350
175
350
307
Table 11: Additional Weights - Motors/Exhaust Fans
(026–050)
Table 8: Curb Weights
Additional Motor
Weight (lbs)
Unit (tons)
Additional Exhaust
Fan Weight (lbs)
7.5
0
26
150
10
25
30
150
15
125
35
150
20
175
40
200
25
225
50
200
30
275
HP
Weight (lbs)
Unit (tons)/
Curb Height (inches)
without ERW
with ERW
015–035/14
341
458
015–035/24
501
674
040–050/14
481
619
040–050/24
708
908
Table 9: Energy Recovery Section Weights
Unit Size (tons)
Weight (lbs)
015–020
1200
026–035
1540
040–050
1000
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Table 12: Additional Weights for 6-Row DX Coil and HGRH
Coil
14
Weight (lbs)
Unit Size
(tons)
6 Row DX
HGRH
15–20
118
70
26–35
164
82
40
187
92
50
231
92
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Mechanical Installation
Condensate Drain Pipe Connection
Figure 10: Rigging the Unit (MPS 026– 035 Example)
The unit is provided with a 1" male NPT condensate drain
connection. For proper drainage, level the unit and drain pan
side to side and install a P-trap.
Figure 12 shows the layout of the condensate drain
connection. The distance from the drain pan outlet to the
horizontal run of the P-trap should be a distance of twice the
static pressure in the drain pan.
Example: If the static pressure as measured in the drain pan
is 1.5", then the distance between the drain outlet and the
horizontal run should be 3".
Draining condensate directly onto the roof may be acceptable;
refer to local codes. Provide a small drip pad of stone, mortar,
wood, or metal to protect the roof against possible damage.
If condensate is piped into the building drainage system, pitch
the drain line away from the unit a minimum of 1/8" per foot.
The drain line must penetrate the roof external to the unit.
Refer to local codes for additional requirements. Sealed drain
lines require venting to provide proper condensate flow.
Where the cooling coils have intermediate condensate pans on
the face of the evaporator coil, copper tubes near both ends of
the coil supply drainage to the main drain pan. Verify the tubes
are in place and open before putting the unit into operation.
Figure 11: Rigging the Unit (MPS 040–050 Example)
G
E
A
Periodically clean to prevent microbial growth/algae buildup
from plugging the drain and causing the drain pan to overflow.
Clean drain pans to prevent the spread of disease. Cleaning
should be performed by qualified personnel.
C
F
D
WARNING
H
Drain pans must be cleaned periodically. Material in uncleaned
drain pans can cause disease. Cleaning should be performed
by qualified personnel.
L4
L3
B
Figure 12: Condensate Drain Connection
L2
L1
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15
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Mechanical Installation
Damper Assemblies
The optional damper assemblies described in this section
are ordered with factory-installed actuators and linkages.
The following sections describe the operation and linkage
adjustment of the factory option.
Cabinet Weather Protection
This unit ships from the factory with fully gasketed access
doors and cabinet caulking to provide weather resistant
operation. After the unit is set in place, inspect all door gaskets
for shipping damage and replace if necessary.
Protect the unit from overhead runoff from overhangs or other
such structures.
Figure 13: Damper Assembly
CAUTION
Transportation, rigging, or maintenance can damage the
unit’s weather seal. Periodically inspect the unit for leakage.
Standing moisture can promote microbial growth, disease, or
damage to the equipment and building
Linkage
Installing Ductwork
Actuator
Economizer Dampers
On vertical-supply/vertical-return units, if a Daikin roof curb
is not used, the installing contractor should make an airtight
connection by attaching field fabricated duct collars to the
bottom surface of the unit’s duct opening. Do not support
the total weight of the duct work from the unit. See roof curb
layouts in Figure 3 on page 7, Figure 4 on page 8 or
Figure 5 on page 9.
Table 13: Rated Airflow
As the single actuator modulates, the outside air dampers
open, the return air dampers close, and the exhaust air exits
the unit through the gravity relief dampers.
The economizer comes with manually adjustable linkage
(Figure 13). The damper is set so that the crankarm moves
through a 90-degree angle to bring the economizer dampers
from full open to full close. Mechanical stops are placed in the
crankarm mounting bracket. Do not remove stops. Driving the
crankarm past the stops results in damage to the linkage or
damper.
Outdoor Air Dampers (0% to 30%)
These dampers are intended to remain at a fixed position during
unit operation, providing fresh air quantities from 0 to 30% of the
total system airflow, depending on the damper setting.
The damper position may be set at the unit controller keypad
(refer to OM 920 for further detail). During unit operation, the
damper is driven to the position set at the unit controller. During
the off cycle, the damper is automatically closed.
Unit Size (tons)
AHRI Rated Airflow
015
3750
017
4375
020
5000
026
6875
030
7500
035
8750
040
10000
050
12500
Use flexible connections between the unit and ductwork to
avoid transmission of vibration from the unit to the structure.
To minimize losses and sound transmission, design duct work
per ASHRAE and SMACNA recommendations.
Where return air ducts are not required, connect a sound
absorbing T or L section to the unit return to reduce noise
transmission to the occupied space.
Ductwork exposed to outdoor conditions must be built in
accordance with ASHRAE and SMACNA recommendations
and local building codes.
WARNING
Mold can cause personal injury. Materials such as gypsum
wall board can promote mold growth when damp. Such
materials must be protected from moisture that can enter units
during maintenance or normal operation.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
16
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Mechanical Installation
Installing Duct Static Pressure Sensor
Taps
Figure 14: Static Pressure Tubing Knockout Location
For all VAV units, duct static pressure taps must be field
installed and connected to the static pressure sensor 1 (SPS1)
in the unit. Sensor SPS1 is standard on VAV units and is
located in the main control panel.
Carefully locate and install the duct static pressure sensing
tap. Improperly locating or installing the sensing tap causes
unsatisfactory operation of the entire variable air volume
system. Below are pressure tap location and installation
recommendations. The installation must comply with local code
requirements.
1. Install a tee fitting with a leak-tight removable cap in each
tube near the sensor fitting. This facilitates connecting a
manometer or pressure gauge if testing is required.
2. Use different colored tubing for the duct pressure (HI)
and reference pressure (LO) taps, or tag the tubes.
Daikin recommends 3/16" ID tubing.
Figure 15: Duct Static Pressure Sensing Tubing
Installation
Main Control Panel
Condenser Section
3. Locate the duct pressure (HI) tap near the end of a long
duct to ensure that all terminal box take-offs along the
run have adequate static pressure.
4. Locate the duct tap in a nonturbulent flow area of the
duct. Keep it several duct diameters away from take-off
points, bends, neckdowns, attenuators, vanes, or other
irregularities.
HI Line
LO Line
5. Use a static pressure tip (Dwyer A302 or equivalent) or
the bare end of the plastic tubing for the duct tap. (If the
duct is lined inside, use a static pressure tip device.)
Roof
Remote Sense Point
6. Install the duct tap so that it senses only static pressure
(not velocity pressure). If a bare tube end is used,
it must be smooth, square (not cut at an angle) and
perpendicular to the airstream (see Figure 15).
Ductwork
(Remote Location)
To Sensor
HI Input
Rubber
Grommet
To Sensor
LO Input
7. Locate the reference pressure (LO) tap near the duct
pressure tap within the building. If the tap is not connected
to the sensor, unsatisfactory operation will result.
8. Route the tubes through the curb and feed them into the
unit through the knockout in the bottom of the control
panel (see Figure 14). Connect the tubes to appropriate
barbed fittings (on SPS1) in the control panel. (Fittings
are sized to accept 3/16" ID tubing.)
www.DaikinApplied.com
SPS1
17
Tubing Extends
Through Approx. 1/8”
Pressure Sensing
Tubing
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Mechanical Installation
Installing Building Static Pressure
Sensor Taps
Figure 16: Outdoor Static Pressure Tubing Installation
If a unit has building static pressure control capability, you
must field install and connect static pressure taps to the static
pressure sensor SPS2 in the unit. This sensor is located at the
bottom of the main control panel next to SPS1.
Carefully locate and install the two static pressure sensing
taps. Improper location or installation of the sensor taps causes
unsatisfactory operation. Below are pressure tap location and
installation recommendations for both building envelope and
lab, or “space within a space” pressure control applications.
The installation must comply with local code requirements.
CAUTION
Fragile sensor fittings. If you must remove tubing from a
pressure sensor fitting, use care. Do not use excessive force
or wrench the tubing back and forth to remove or the fitting
can break off and damage sensor.
Lab Pressurization Applications
1. Install a “T” fitting with a leak-tight removable cap in each
tube near the sensor fitting. This facilitates connecting a
manometer or pressure gauge if testing is required.
Building Pressurization Applications
1. Install a tee fitting with a leak-tight removable cap in each
tube near the sensor fitting. This facilitates connecting a
manometer or pressure gauge if testing is required.
2. Use different colored tubing for the controlled space
pressure (high) and reference pressure (low) taps, or tag
the tubes.
2. Locate the building pressure (high) tap in the area that
requires the closest control. Typically, this is a ground
level floor that has doors to the outside.
3. Regardless whether the controlled space is positive or
negative with respect to its reference, locate the high
pressure tap in the controlled space (the setpoint can be
set between -0.2" and 0.2" wc).
3. Locate the building tap so it is not influenced by any
source of moving air (velocity pressure). These sources
may include air diffusers or outside doors.
4. Locate the reference pressure (low) tap in the area
surrounding the controlled space. Not locating the
reference tap to the sensor results in unsatisfactory
operation.
4. Route the building tap tube through the curb and feed
it into the unit through the knockout in the bottom of the
control panel (refer to Figure 14). Connect the 3/16" ID
tube to the (high) fitting for sensor SPS2.
5. Locate both taps so they are not influenced by any
source of moving air (velocity pressure). These sources
may include air diffusers or doors between the high and
low pressure areas.
5. Locate the reference pressure (low) tap on the roof.
Keep it away from the condenser fans, walls, or anything
else that may cause air turbulence. Mount it high
enough above the roof so it is not affected by snow. Not
connecting the reference tap to the sensor results in
unsatisfactory operation.
6. Route the building tap tube between the curb and the
supply duct and feed it into the unit through the knockout
in the bottom of the control panel.
7. Connect the tube to the (high) fitting for sensor SPS2.
6. Use an outdoor static pressure tip (Dwyer A306 or
equivalent) to minimize the adverse effects of wind.
Place some type of screen over the sensor to keep out
insects. Loosely packed cotton works well.
7. Route the outdoor tap tube out of the main control panel
through a small field-cut opening in the upright. Seal the
penetration to prevent water from entering. Connect the
3/16" ID tube to the (low) fitting for sensor SPS2.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
18
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Electrical Installation
Electrical Installation
Field Power Wiring
Wiring must comply with all applicable codes and ordinances.
The warranty is voided if wiring is not in accordance with these
specifications.
A ground lug is provided in the control panel. Size the
grounding conductor in accordance with Table 250-95 of the
National Electrical Code.
According to the National Electrical Code, a disconnecting
means shall be located within sight of and readily accessible
from the air conditioning equipment. The unit can be ordered
with an optional factory mounted disconnect switch. This switch
is not fused. Power leads must be over-current protected at the
point of distribution. The maximum rated overcurrent protection
device (MROPD) value appears on the unit nameplate.
In compliance with the National Electrical Code, a 115 V
factory mounted service receptacle outlet is provided. This
outlet must be powered by a field connected 15 A, 115 V power
supply. Leads are brought into the unit through a 7/8" knockout
in the bottom of the main control panel.
All Units
All units are provided with internal power wiring for single point
power connection. The power block or an optional disconnect
switch is located within the main control panel. Field power
leads are brought into the unit through knockouts in the bottom
of the main control panel (see Figure 17 and also Table 14).
Refer to the unit nameplate to determine the number of power
connections.
NOTE: To wire entry points, refer to certified drawings for
dimensions.
WARNING
Hazardous voltage. Can cause severe injury or death.
Disconnect electric power before servicing equipment. More
than one disconnect may be required to de-energize the unit.
The preferred entrance for power cables is through the bottom
knockouts provided on the unit. If a side entrance is the only
option, a hole may be drilled in the stationary upright.
Table 14: Recommended Field Power Wiring
Ampacity (MCA)
No. of Power
Wires per Phase
Wire Gauge
20
25
35
50
65
85
100
115
130
150
175
200
230
255
300
350
400
460
510
600
690
765
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
3
3
3
14
12
10
8
6
4
3
2
1
1/0
2/0
3/0
4/0
250
1/0
2/0
3/0
4/0
250
3/0
4/0
250
Insulation
Temperature
Rating (°C)
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
Notes:
1. All wire sizes assume separate conduit for each set of parallel conductors.
2. All wire sizes based on NEC Table 310-16 for 75°C THW wire (copper). Canadian electrical code wire ampacities may vary.
3. All wire sizes assume no voltage drop for short power leads.
The minimum circuit ampacity (MCA) is shown on the unit
nameplate. Refer to Table 14 for the recommended number of
power wires.
Copper wire is required for all conductors. Size wires in
accordance with the ampacity tables in Article 310 of the
National Electrical Code. If long wires are required, it may
be necessary to increase the wire size to prevent excessive
voltage drop. Wires should be sized for a maximum of 3%
voltage drop. Supply voltage must not vary by more than 10%
of nameplate. Phase voltage imbalance must not exceed 2%.
(Calculate the average voltage of the three legs. The leg with
voltage deviating the farthest from the average value must not
be more than 2% away.) Contact the local power company for
correction of improper voltage or phase imbalance.
Figure 17: MPS Power Wiring Knockout Locations
CAUTION
Provide proper line voltage and phase balance. Improper line
voltage or excessive phase imbalance constitutes product
abuse. It can cause severe damage to the unit's electrical
components.
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19
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Electrical Installation
Electrical Installation
Field Control Wiring
The Maverick rooftop units are available with the following field
control connections:
Descriptions of these field connections are included in the
MicroTech III Unit Controller manual (OM 920).
• Space sensor.
• Space sensor with setpoint adjustment.
• Fan operation output.
• VAV box output.
• Remote alarm output.
WARNING
Electrical shock hazard. Can cause severe injury or death.
Connect only low voltage NEC Class II circuits to terminal
block TB2.
• External discharge air temperature reset.
• Outdoor air damper minimum position adjustment.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
20
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Preparing Unit for Operation
Preparing Unit for Operation
Spring Isolated Fans
Figure 18: Spring Mounts
WARNING
Moving machinery hazard. Can cause severe injury ordeath.
Before servicing equipment, disconnect power and lockoff.
More than one disconnect may be required to de-energizeunit.
Prior to operating the fans for the first time, refer to Check,
Test, and Start Procedures on page 87.
Releasing Spring Mounts
The spring-mounted supply fan is locked down with four
shipping bolts for shipment. Remove each shipping bolt before
operating the fans. Figure 18 shows a typical spring mount
with a height adjustment nut and a shipping bolt.After removing
the shipping bolts, rock the fan assembly by hand to check for
freedom of movement.
Adjusting Spring Mounts
During operation all fans should ride level. Level the fan
assembly by performing the following:
1. Loosen the 3/8" cap screw (do not remove).
2. Loosen the spring cap nut.
3. Rotate the 5/8" adjustment nut counter-clockwise to raise
the fan assembly, or clockwise to lower the fan assembly.
4. Tighten the 3/8" cap screw.
5. Tighten the spring cap nut.
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21
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Gas Heat
Optional Gas Heat
Gas Furnace Design
If the 8th digit in the model number is a “G”, the rooftop unit
was furnished with a factory installed furnace (Example,
MPS035FG). The Maverick commercial rooftop units are
available with either the low heat input or the high heat input
furnace (see capacities in Table 15). This packaged gas heat
rooftop unit is designed for outdoor non-residential installations
only.
Figure 19: Gas Heat Section
The gas heat furnace design consists of a tubular heat
exchanger, in-shot burner manifold with gas valve, induced
combustion blower, gas heat DDC control module and all
operational safeties. The tubular heat exchanger can come
with the standard aluminized steel construction or the optional
stainless steel construction. The safety switches include a
high-limit temperature switch, an auxiliary high-limit switch,
a combustion blower proof of airflow, and the flame roll-out
switch (see Figure 20).
Field Gas
Piping
The high limit switch is an automatic reset switch and it opens
up at 160°F to shut the furnace down and closes at 130°F. The
auxiliary limit switch is a manual reset and opens up at 180°F
to shut the furnace down.
Gas Heating Capacity Data
Table 15: MPS 015F – 050F Gas Heating Capacities
Unit Size
Data
015–020
026–035
040–050
Low Heat
High Heat
Low Heat
High Heat
Low Heat
High Heat
Heating Input (MBh)
240
480
300
600
400
800
Heating Output (MBh)
192
384
240
480
320
640
Steady State Efficiency
80%
80%
80%
80%
80%
80%
Number of Stages
2
4
2
4
2
4
Turndown1
4:1
8:1
4:1
8:1
4:1
8:1
Minimum Airflow
2960
5920
3700
7400
4900
9800
Maximum Temperature Rise
60°F
100°F
60°F
85°F
60°F
85°F
Gas Main Pressure
Natural Gas (in. wc)
7-14
7-14
7-14
7-14
7-14
7-14
Liquid Propane (in. wc)
12-14
12-14
12-14
12-14
12-14
12-14
Stage 1 (in. wc)
1.2
1.2
1.2
1.2
1.2
1.2
Stage 2 (in. wc)
3.2
3.2
3.2
3.2
3.2
3.2
Low fire2
0.4
0.4
0.4
0.4
0.4
0.4
Manifold Pressure
Natural Gas (per gas valve)
Propane
Stage 1 (in. wc)
2.3
2.3
2.3
2.3
2.3
2.3
Stage 2 (in. wc)
10.0
10.0
10.0
10.0
10.0
10.0
Low fire2
N/A
Note:
1 Modulating gas heat only.
2 Modulating gas heat not available with propane.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
22
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Optional Gas Heat
Figure 20: Staged Furnace Assembly
Warranty Exclusion
Ventilation & Flue Pipe Requirements
Warranty is void if the furnace is operated in the presence of
chlorinated vapors, if the airflow through the furnace is not in
accordance with rating plate, or if the wiring or controls have
been modified or tampered with.
The Daikin rooftop unit is equipped with an outdoor air hood
to supply adequate combustion air. The unit also has a flue
outlet assembly and requires no additional chimney, flue pipe,
Breidert cap, draft inducer, etc.
Factory Checkout
WARNING
Hot surface hazard. Can cause severe equipment damage,
personal injury, or death. Allow burner assembly to cool
before servicing equipment.
WARNING
Units equipped with gas heating must not be operated
in an atmosphere contaminated with chemicals which
will corrode the unit such as halogenated hydrocarbons,
chlorine, cleaning solvents, refrigerants, swimming pool
exhaust, etc. Exposure to these compounds may cause
severe damage to the gas furnace and result in improper
or dangerous operation. Operation of the gas furnace in
such a contaminated atmosphere constitutes product abuse
and will void all warranty coverage by the manufacturer.
Questions regarding specific contaminants should be referred
to your local gas utility.
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23
This complete furnace was fired and tested at the factory. The
unit was fired through several complete sequences of start-up
through shutoff to check operation. A check was made of the
air switch, gas pressure switch, high limit operation.
This checkout normally eliminates on-the-job start-up
problems; however, the equipment is subject to variable job
conditions and shipping shocks can change adjustments,
cause damage, and loosen connections and fasteners.
Therefore, it is necessary to go through the complete start-up
procedure even though the unit may appear to be operating
properly.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Gas Heat
Installation
IMPORTANT
This furnace must be installed by an experienced
professional installation company that employs fully
trained and experienced technicians. Install the furnace
in accordance with the manufacturer's instructions and
local codes. In the absence of local codes, follow the
National Fuel Gas Code, ANSI Z223.1/NFPA 54, or the CSA
B149.1, Natural Gas and Propane Installation Code.
Outdoor Air (OA) Hood
The OA hood (Figure 22) is not installed at the factory
becauseit would increase the width of the unit beyond the
allowableshipping width. The hood is shipped in a box in the
fansection.
The OA hoods must be installed over the outdoor air openings.
1. Remove and discard the shipping covers.
2. Position the hood over the OA openings.
3. Line assembly holes up.
WARNING
Sharp edges hazard. Can cause personal injury or death.
Sheet metal parts, self-tapping screws, clips, and similar
itemsinherently have sharp edges, and it is necessary that
theinstaller exercise caution when handling these items.
4. Install screws to fasten the OA hood.
The OA hoods must be installed before the furnace is operated.
Figure 22: Outdoor Air (OA) Hood Installation
Flue Box
The flue box (Figure 21) is not installed at the factory because
it would increase the width of the unit beyond the allowable
shipping width.
The flue box must be installed over the combustion exhaust
openings. All holes are prepunched, the fasteners are
furnished and everything is shipped inside the fan section.
1. Remove and discard the shipping covers.
2. Position the flue box over the exhaust openings.
3. Line assembly holes up.
4. Install screws to fasten the flue box to the side of the unit.
Figure 21: Flue Box Installation
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
24
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Optional Gas Heat
Electrical
Gas Piping
The Daikin burner receives its electrical power from the main
unit control panel. No additional power wiring must be routed
to the burner. The sequencing of the burner is also controlled
through this panel and therefore is factory wired. No additional
wiring will be required.
Gas piping must be sized to provide the minimum required
pressure at the burner when the burner is operating at
maximum input. Consult your local utility on any questions on
gas pressure available, allowing piping pressure drops, and
local piping requirements.
DANGER
If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal
injury, or loss of life.
A. This appliance does not have a pilot. It is equipped with
an ignition device which automatically lights the burner. Do
not try to light the burner by hand.
B. Before operating, smell all around the appliance area for
gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle on the floor.
What to do if you smell gas:
• Do not try to light any appliance.
Install all piping in accordance with the National Fuel Gas
Code (ANSI Z223.1), (NFPA 54-1999) and any applicable local
codes.
The proper size piping must be run from the meter to the
gas burner without reductions. Undersized piping will result
in inadequate pressure at the burner. The pressure will be at
its lowest when it is needed the most, at times of maximum
demand. Therefore, it can cause intermittent hard-to-find
problems because the problem may have left before the
service technician has arrived. Avoid the use of bushings
wherever possible.
Remove all burrs and obstructions from pipe. Do not bend
pipe; use elbows or other pipe fittings to properly locate pipe.
A drip leg and a manual shut-off must be installed in the vertical
line before each burner such that it will not freeze. Install unions
so gas train components can be removed for service. All pipe
threads must have a pipe dope which is resistant to the action of
LP gas. After installation, pressurize the piping as required and
test all joints for tightness with a rich soap solution. Any bubbling
is considered a leak and must be eliminated. Do not use a
match or flame to locate leaks.
• Do not touch any electric switch, do not
use any phone in your building.
• Immediately call your gas supplier from a
phone in a neighboring building. Follow
the gas supplier's instructions.
• If you cannot reach your gas supplier,
call the fire department.
C. Use only your hand to push in or turn the gas control knob.
Never use tools. If the knob will not push in or turn by hand,
don't try to repair it, call a qualified service technician.
Force or attempted repair may result in a fire or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect
the appliance and to replace any part of the control system
and any gas control which has been under water.
Gas Piping Routing Into Unit
On-The-Roof Piping
1. Remove knockout on upright (refer to Figure 23).
2. Route gas supply pipe through hole. Carefully plan pipe
route and fitting locations to avoid interference with
swinging of doors, etc.
Figure 23: Piping Schematic
Gas Pressure Requirements
The pressure furnished to the main gas valve must not exceed
13.9" wc. When the supply pressure is above 13.9" wc, a
high pressure regulator must precede the appliance gas
pressure regulator. The inlet gas pressure must not exceed the
maximum pressure rating of the high pressure regulator, and
the outlet pressure must furnish gas to the appliance pressure
regulator within the pressure range mentioned above.
Field Gas Piping
7.0" (177.8)
www.DaikinApplied.com
25
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Gas Heat
Table 16: Capacity of Pipe Natural Gas (CFH)
With Pressure Drop of 0.3" W.C. & Specific Gravity of 0.60
Pipe Size-inches (Ips)
Pipe Length
(ft)
½
¾
1
1¼
1½
2
2½
3
4
10
132
278
520
1050
1600
2050
4800
8500
17500
20
92
190
350
730
1100
2100
3300
5900
12000
30
73
152
285
590
890
1650
2700
4700
9700
40
63
130
245
500
760
1450
2300
4100
8300
50
56
115
215
440
670
1270
2000
3600
7400
60
50
105
195
400
610
1150
1850
3250
6800
70
46
96
180
370
560
1050
1700
3000
6200
80
53
90
170
350
530
990
1600
2800
5800
90
40
84
160
320
490
930
1500
2600
5400
100
38
79
150
305
460
870
1400
2500
5100
125
34
72
130
275
410
780
1250
2200
4500
150
31
64
120
250
380
710
1130
2000
4100
175
28
59
110
225
350
650
1050
1850
3800
200
26
55
100
210
320
610
980
1700
3500
NOTE: Use multiplier below for other gravities and pressure drops.
Sequence of Operation (Staged Control)
Table 17: Specific Gravity Other Than 0.60
Specific Gravity
Multiplier
0.50
1.100
0.60
1.000
0.70
0.936
0.80
0.867
0.90
0.816
1. Unit DDC control calls for heat.
1.00
0.775
2. Furnace DDC control module receives a call for heat.
Low Heat Option (2 Stage Control)
The following details the sequence of operation for the low
heat option.
Propane-Air
1.10
3. High limit switch is checked for safe condition.
0.740
4. Proof of airflow switch is check for combustion airflow.
Propane
1.55
0.622
5. 60 second prepurge cycle starts.
Butane
2.00
6. Spark ignitor is activated for 3 seconds.
0.547
7. Gas valve receives a command for stage 1 of heat.
Table 18: Pressure Drop Other Than 0.3"
8. Burner is ignited.
Pressure Drop
Multiplier
Pressure
Multiplier
0.1
0.577
1.0
1.83
0.2
0.815
2.0
2.58
10. Furnace DDC controller receives a stage 2 heat command.
0.3
1.000
3.0
3.16
11. Gas valve receives a command for stage 2 of heat.
0.4
1.16
4.0
3.65
0.6
1.42
6.0
4.47
0.8
1.64
8.0
5.15
9. Unit DDC controller calls for stage 2 of heat.
High Heat Option (4 Stage Control)
For a unit with the optional high heat the above sequence is
followed for the first two stages.
For the remaining 2 stages the above procedure is repeated on
the second furnace module.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
26
www.DaikinApplied.com
Optional Gas Heat
Sequence of Operation (Modulating Burner)
Low Heat Option with Modulation
High Heat Option with Modulation
The following details the sequence of operation for the low
heat option.
The following details the sequence of operation for the high
heat option. This option includes dual burners with one being
modulating and the other being 2 stage control.
1. Unit DDC controller calls for heat.
2. Furnace DDC control module receives a call for heat.
1. Unit DDC controller calls for heat.
3. Furnace safety switches and DDC control are checked
for safe conditions.
3. High limit switch is checked for safe condition.
2. Top Furnace DDC control module receives a call for heat.
4. 45 second prepurge cycle starts. Proof of airflow switch
is checked for combustion airflows.
4. Proof of airflow switch is checked for combustion airflow.
5. 45 second prepurge cycle starts.
5. Spark ignitor is activated.
6. Spark ignitor is activated.
6. Gas valve receives a signal to open fully.
7. Gas valve receives a signal to open fully.
7. Burner is ignited and runs for 20 seconds in high fire.
8. Burner is ignited and runs for 30 seconds in high fire
NOTE: If call for heat is interrupted during this timing, the
furnace will be locked in for the 20 seconds cycle.
8. Gas valve and induction blower motor receives a signal
to modulate burner output to match the unit discharge air
temperature setting.
9. Modulating burner gas valve and induction blower motor
receives a signal to modulate burner output to match the
unit discharge air temperature setting.
10. If modulating burner is unable to meet discharge
temperature set point, furnace DDC control calls for
third stage of heating. The top furnace is reduced to
low (50%) fire. The bottom furnace is sequenced on per
stage furnaces sequence of operation (steps 2 - 8).
11. Staged burner gas valve receives a signal to open to 50%.
12. Modulating burner gas valve and induction blower motor
receives a signal to modulate burner output to match the
unit discharge air temperature setting.
13. If stage 3 and modulating furnace is unable to meet
discharge temperature setpoint, furnace DDC controller
calls for stage 4 heat. The bottom furnace will stage up to
high fire and the modulating furnace will reduce to 50%
operation.
14. Staged burner gas valve receives a signal to open fully.
15. Modulating furnace's gas valve and induction blower
motor receives a signal to modulate burner output to
match the unit discharge air temperature setting.
www.DaikinApplied.com
27
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Gas Heat
Start-Up Procedures
Start-up and service of this equipment must be performed by
trained and experienced technicians. It is highly recommended
that the initial start-up and future service be performed by
Daikin trained technicians who are familiar with working on
live equipment. A representative of the owner or the operator
of the equipment should be present during start-up to receive
instructions in the operation, care and adjustment of the unit.
Start-Up Responsibility
The start-up organization is responsible for determining that
the furnace, as installed and as applied, will operate within the
limits specified on the furnace rating plate.
1. The furnace must not operate at an airflow below the
specified Minimum Airflow CFM (refer to Table 15 on
page 22). On variable air volume systems it must
be determined that the furnace will not be operated
if or when system cfm is reduced below the specified
minimum airflow cfm.
WARNING
Overheating or failure of the gas supply to shut off can
cause equipment damage, severe personal injury or
death. Turn off the manual gas valve to the appliance before
shutting off the electrical supply.
DANGER
If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal
injury, or loss of life.
2. It must be established that the gas supply is within the
proper pressure range (refer to Table 15 on page 22).
Operating Procedures
Before Start-Up
1. Notify inspectors or representatives who may be required
to be present during start-up of gas fuel equipment.
These could include the gas utility company, city gas
inspectors, heating inspectors, etc.
A. This appliance does not have a pilot. It is equipped with
an ignition device which automatically lights the burner. Do
not try to light the burner by hand.
2. Review the equipment and service literature and become
familiar with the location and purpose of the furnace
controls. Determine where the gas and power can be
turned off at the unit and before the unit.
B. Before operating, smell all around the appliance area for
gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle on the floor.
What to do if you smell gas:
3. Determine that power is connected to the unit and
available.
• Do not try to light any appliance.
4. Determine that the gas piping, meter, and service
regulator have been installed, tested, and meet the
equipment requirements.
• Do not touch any electric switch, do not
use any phone in your building.
• Immediately call your gas supplier from a
phone in a neighboring building. Follow
the gas supplier's instructions.
5. Determine that proper instruments will be available for
the start-up. A proper start-up requires the following:
voltmeter, manometer or gauges with ranges for both
manifold pressure and inlet gas pressure.
• If you cannot reach your gas supplier,
call the fire department.
C. Use only your hand to push in or turn the gas control knob.
Never use tools. If the knob will not push in or turn by hand,
don't try to repair it, call a qualified service technician.
Force or attempted repair may result in a fire or explosion.
Start-Up Preliminary
Close gas main.
1. Check the burner fan wheel for binding, rubbing, or loose
setscrews.
D. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect
the appliance and to replace any part of the control system
and any gas control which has been under water.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
2. Check power.
3. Purge the gas lines.
4. Leak check. Using a rich soap-water mixture and a
brush, check the gas lines for leaks. Correct all leaks
before starting furnace.
28
www.DaikinApplied.com
Optional Gas Heat
Service
Start-Up
1. Set the thermostat to the lowest setting.
The furnace DDC controller has diagnostic information for
troubleshooting the furnace operation. The ignition control
module has a LED light that will flash when an abnormal
condition occurs. See Table 19 and Table 20 for an explanation
of the diagnostic information.
2. Turn off all electric power to the appliance.
3. This appliance is equipped with an ignition device which
automatically lights the burner. Do NOT try to light the
pilot by hand.
4. Open the control access panel.
Maintenance
5. Turn the gas control clockwise to “OFF”.
Planned maintenance is the best way to avoid unnecessary
expense and inconvenience. Have this system inspected
at regular intervals by a trained and experienced service
technician. The following service intervals are typical for
average situations but will have to be adjusted to suit your
particular circumstances.
6. Wait five (5) minutes to clear out any gas. Then, smell
for gas, including near the floor. If you smell gas, STOP!
Follow step “B” in the DANGER label on this page. If you
don't smell gas, proceed to the next step.
7. Turn the gas control counter-clockwise to “ON”.
Fuel pressure settings and control settings should be made
only by persons thoroughly experienced with the burner and
control system, and must not be tampered with by persons
without such experience.
8. Close the control access panel.
9. Turn on all electric power to the appliance.
10. Set thermostat to desired setting.
11. If the furnace will not operate, refer to Turning off Gas to
the Unit, and call your service technician or gas supplier.
Turning off Gas to the Unit
1. Set the thermostat to the lowest setting.
Always replace covers on burner controls and boxes as the
electrical contacts are sensitive to dust and dirt. Perform
maintenance of controls, gas valves, and other components in
accordance with instructions contained in the manufacturer's
bulletins.
Monthly
2. Turn off all electrical power to the appliance if service is
to be performed.
Check air filters and replace if dirty.
3. Open the control access panel.
Twice Yearly
4. Turn the gas control knob clockwise to “OFF”. Do not
force.
1. Burner Air - Check burner fan wheel for dirt buildup and
lint. Check combustion air intake louver and flue box for
dirt buildup and accumulation of windborne debris.
5. Close the control access panel.
2. Cleaning - Inspect flue tubes and combustion chamber,
cleaning as required. Keep burner vestibule clean. Dirt
and debris can result in burner air blockages.
Yearly
Gas Train -Check all valves, piping and connections for
leakage. Inspect and clean flame rod, ignition electrode, and
burner manifold.
Condensate Pan/Drain/P-Trap - Check pan, drain, and p-trap.
www.DaikinApplied.com
29
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Gas Heat
Ignition Control Module for Gas Furnace
Figure 24: Typical Staged Gas Furnace Electrical Schematic with Sensor
L1
L2
B
W
W
1
B
115VAC
1016-427
Ignition Module
Gr
2
40VA
BL
B
Gnd
W
Y
24VAC
G
COM
C
MV
PS2
Y
2 Stage Gas
Valve
Y
C
BL
MV
OR
HI
ROS1
ROS2
Y
PS1
W
BL
X
R
HV
OR
2
APS
Y
1
Y
R
OR
Igniter
FS
W
Flame Sensor
W
APS
ROS1
ROS2
L1
IND
B
Comb Fan
Motor
Airflow Proving Switch
Roll Out Switch #1
Roll Out Switch #2
W
1/4" quick connect termination to harness
from main control panel
Terminal Block
Ignition Control Module LED Diagnostics
The following LED indicators can be used to diagnose faults
associated with the staged gas furnace.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Table 19: LED Indicator and Fault Conditions
30
Indicator
Fault Condition
Steady Off
No power or control hardware fault
Steady On
Power applied, control OK
1 Flash
Combustion fan motor energized, pressure switch open
2 Flashes
Combustion fan motor off, pressure switch closed
3 Flashes
Ignition lockout from too many trials
4 Flashes
Ignition lockout from too many flame losses within
single call for heat
5 Flashes
Control hardware fault detected
www.DaikinApplied.com
Optional Gas Heat
Ignition Control Module for Modulating Gas Furnace
Figure 25: Typical Modulating Gas Furnace Electrical Schematic with Sensor
L1
L2
WHT
BLK
115 VAC
40VA
OR G
Limit
Press
Switch
R
WHT
T9 Flame
J9
Inducer
J8
T7
T5
+
BLK
WHT
Flame Sensor
HS I
MJ
W
+
BRN
St atus
LED
J4
0-10V DC
input signal
BLU
MV
RTN
MV
GRY
-
RED
MOD
GRY
Modulating
Gas Valve
RED
MOD
RTN
J3
OR G
APS
WH T
GND
T4
T2
Neutral
Hot
BLK
WH T
24V AC
ROS2
24VAC
115 VAC
ROS1
BLU
WHT
J5
24VAC
Comm Po rt
BLK
Combustion
Board
WHT
DSI
Board
RED
Spark Electrode
Neutral
WH T
Hot
BLK
M
Variable
Inducer
0-10V DC
120 VAC
Pre ssu re
Tr ansducer
T3
T6
Neutral
Ground
GRN
Gn d
+
T1
Sensing hose
to fan
APS
ROS1
ROS2
Airflow Prov ing Sw itch
Roll Out Switch #1
Roll Out Switch #2
Variable Furnace Controller
LED Diagnostic Informatio
1/4" Quick Connec t Termination
Terminal Block
Table 20: LED Indicator and Fault Conditions
n
Indicator
Fault Condition
Daikin's furnace controller is an electronic device that delivers
Flash(es )
C olor Condition
No power or control hardware fault Indicator Fault
Steady Off
full control of the modulating
furnace.
Control
includes
Condition
Of f
N/A
N o power to Contro l
sequencing, ignition,Steady
safety,
the control
valve,or no 24VAC power
Onmodulation
Re d of
C ontrol
Fault Detected
Steady On
Control fault detected or no 24 VAC power
and the induced draft motor.
InputsRetod theC furnace
board
1
ombustioncontrol
f an motor
energiz ed, Pressure
switch open Combustion fan motor energized, pressure switch open
1 Flash
2 analog Re
d
Inducer
air pressure
reads above ze ro level w hen the inducer is of f
are an a 0-10V signal. The
signal
will modulate
the
Inducer air pressure reads above zero level when the
3 load. Safety
Re d inputs
F lame include
is ON when
it should be OFF or 2 Flashes
flame is OFF when it should be ON inducer is off
burner down to 25% of full
pressure
4
Re d
G as valve ON when it should be OFF or OFF when it should be ON
Flame is on when is should be off or flame is off when it
line and electrical connection
fromRe
the
5
d airflow
S afetyproofing
rela y ON wswitch
hen it should be OFF3orFlashes
OFF when it should be ON
should be on
and electrical connection
rollout
Control
6 from the Re
d
Eswitches.
xcessi ve plenum
temperature
Gas
valve
is
on
when
is should be off or gas valve is off
4 Flashes
Re d modulating
High limit switch
open or fuse open
board outputs are to the7 igniter board,
gas valve,
when it should be on
8
Re d
P ressure sw itch fa iled to operate or m odulation current
is incorrect
and to the induce draft motor.
Safety
relay is on when it should be off or safety relay is off
9
Slow
1
2
3
Rapi d
The following LED indicators
can
Re d
S afety startup fa iled to validate induc
Green Normal operation -No call for heat
G reen Call for heat
G reen Gas ON -ca ll for heat
G reen Gas ON -no ca ll for heat
Amber
be
usedRetr
toydiagnose faults
Ignition Control Module LED
Diagnostics
associated with the modulating gas furnace.
www.DaikinApplied.com
31
5 Flashes
er
air pat h
when it should be on
6 Flashes
Excessive plenum temperature
7 Flashes
High limit switch is open or fuse is open
8 Flashes
Pressure switch failed to operate or modulation current is
incorrect
Slow Flash
Normal operation - no call for heat
1 Slow
Flash Call for heat
2 Slow
Flashes Gas on - call for heat
3 Slow
Flashes Gas on - no call for heat
Rapid Flash
Retry
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Electric Heat
Optional Electric Heat
Electric Heater Design
Figure 26: Electric Heat Section
If the 8th digit in the model number is an “E”, the rooftop
unit was furnished with a factory installed electric furnace
(Example, MPS035FE). The Maverick commercial rooftop
units are available with low, medium, or high heat output (see
capacities in Table 21). This packaged electric heat rooftop unit
is designed for outdoor non-residential installations only.
The electric heat design consists of a heating coil, DDC staging
control, and all operational safeties. The safety switches
include high-limit temperature switches and individual coil
fusing.
The high limit switch is an automatic reset switch. It opens the
control circuit and shuts the heater down when the temperature
reaches 160°F. The high limit switch closes again allows the
heater to run when the temperature gets to 130°F. There is a
second level of protection with an auxiliary high limit switch.
This switch opens up and shuts the heater down when the
temperature reaches 250°F. The auxiliary switch automatically
resets again at 220°F. The third level of protection is the
secondary auxiliary high limit switch which shut the heater down
at 285°F. This switch requires a manual reset.
Electric Heating Capacity Data
Table 21: MPS 015 – 050 Electric Heating Capacities
Tons
Nom
cfm
Stages
15
6000
17
Low
Medium
High
kW
Min cfm
MBh
Delta T*
kW
Min cfm
MBh
Delta T*
kW
Min cfm
MBh
Delta T*
4
18
950
61
9.5
36
1900
123
19.0
72
3800
246
38.0
6800
4
18
950
61
8.4
36
1900
123
16.7
72
3800
246
33.5
20
8000
4
36
1900
123
14.2
72
3800
246
28.5
90
4740
307
35.5
26
10,000
4
54
2900
184
16.9
72
3800
246
25.5
90
4800
307
31.4
30
12,000
4
54
2900
184
14.2
72
3800
246
19.0
90
4800
307
23.7
35
14,000
4
54
2900
184
12.2
72
3800
246
16.3
90
4800
307
20.3
40
16,000
4
72
3800
246
14.2
90
4800
307
17.8
108
5700
369
21.3
50
20,000
4
72
3800
246
11.4
90
4800
307
14.2
108
5700
369
17.1
* Temperature rise is calculated at nominal cfm
Electric Heater Data
Table 22: MPS 015 – 050 Electric Heater Data (Maximum
Temp. 60°F)
kW
18
36
54
Voltage
Amps
Voltage
Amps
208
50
kW
208
200
230
45
230
181
460
23
460
90
575
18
575
72
208
100
208
250
230
90
230
226
460
45
460
113
575
36
575
90
208
150
460
136
230
136
575
108
460
68
575
54
72
90
108
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
32
www.DaikinApplied.com
Optional Modulating Hot Gas Reheat
Optional Modulating Hot Gas Reheat
Modulating Hot Gas Reheat
The reheat coil option comes complete with an aluminum micro
channel coil and modulating hot gas valves for leaving air
temperature control.
Figure 27: Ideal for Neutral Air Ventilation Control
On a call for dehumidification, the unit will enable the supply to
be over-cooled by the DX coil. Hot gas from the unit condenser
will be routed to an indoor coil downstream of the DX coil to
reheat the air. Hot gas reheat valves will control how much
hot gas is routed to the indoor coil to maintain a discharge air
setpoint (Figure 28).
Figure 28: Dual 2-Way Valve Refrigeration Schematic
www.DaikinApplied.com
33
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Modulating Hot Gas Reheat
Optional Modulating Hot Gas Reheat
Dehumidification Initiation
Control & Arrangement
An analog sensor is mounted in the return duct, the space, or
outdoors to sense Relative Humidity. The location is selected
by setting the Sensor Location value on the keypad to Return,
Space, or OAT. OAT can only be selected for units with DAT
control. Dehumidification is disabled when the unit is in either
the Heating or Minimum DAT state. When Dehumidification is
enabled, Dehumidification operation is initiated when Humidity
Control is set to either Relative Humidity or Dew Point and
that value rises above the appropriate setpoint by more than
half its deadband. Economizer operation is disabled in the
Dehumidification mode so the unit immediately transitions to
Cooling if Dehumidification is initiated in Economizer state.
In conjunction with dehumidification, MHGRH is used to raise
the temperature of the cooled air to a desirable value. MHGRH
is comprised of a parallel coil arrangement, with both the
condenser and reheat coils of the micro channel type, dual
reheat valves (which operate in concert with one another) and
a check valve. MHGRH components will always be installed in
circuit #2.
During Dehumidification control w/ modulating Hot Gas
Reheat (MHGRH) an analog signal (0-10Vdc) is controlled as
described below.
• A PI Loop is used to control the HGRH valves to maintain
the Discharge Air Temperature from the reheat coil.
Dehumidification Termination
• Compressor staging during reheat (or dehumidification)
will be controlled by the Leaving DX Coil Temperature.
For increased dehumidification during reheat, the
standard default compressor staging range is 45 - 52°F.
Dehumidification is terminated if the selected variable, Relative
Humidity or Dew Point, drops below the appropriate humidity
setpoint by more than half its deadband. Dehumidification is
also terminated if cooling is disabled for any reason or the unit
enters either the Heating or Minimum DAT state. For units with
compressors, the number of cooling stages is reduced by one
and control reverts to normal control when dehumidification
is terminated in the Cooling state. Another compressor stage
change could then occur after one Cooling Stage Time has
elapsed.
• When dehumidification is active in the Cooling state, the
reheat set point equals the DAT Cooling Setpoint. For
DAT units, this is the normal DAT set point resulting from
any reset. For Zone Control units, this set point is the
result of a PI Loop based on the Control Temperature.
• Communication with the reheat control valves is
accomplished by providing a 0-10Vdc signal to a pair of
interface boards which in turn supply the control signal to
the reheat valves (step type).
• In the Fan Only state, no sensible cooling is required,
but dehumidification mode will still be enabled if the
dew point or humidity sensor is not satisfied. Reheat
set point varies from a maximum value (default 65°F)
when the Control Temperature is at or below the heating
changeover setpoint to a minimum value (default 55°F)
when the Control Temperature is at or above the cooling
changeover setpoint.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
34
www.DaikinApplied.com
Optional Modulating Hot Gas Reheat
• Lead/Lag Arrangement w/ MHGRH (when applicable)
• In the reheat mode, the minimum position for the reheat
valves is 10% (1.0 Vdc). The controller will modulate the
reheat valves from this starting position.
—— Alternate staging with circuit #1 as lead will be the
standard default arrangement.
• Reheat valve(s) must be at 0% (0 Vdc) position before
starting the first compressor in the reheat circuit to
prevent pressure spikes.
—— During cooling mode, circuit #1 will lead and load up
before starting circuit #2.
—— During reheat mode, circuit #2 will lead and load up
before starting circuit #1.
—— For reheat operation, compressor(s) in circuit #2 must
be active. If the unit is operating in the cooling mode
when a call for dehumidification/reheat arises,circuit
#2 will become the lead and the controller will bring
on an additional stage of coolingfor dehumidification.
If any compressors in circuit #1 are operating at this
moment they will be switched over to compressors
in circuit #2. Dehumidification operation is disabled if
circuit #2 is disabled for any reason.
• Upon termination of dehumidification (reheat), the
maximum ramp down or decay rate of the reheat control
valves shall be 1% per sec (or 0.1V per sec).
• Upon termination of dehumidification (reheat), staging
of compressor(s) is delayed for 1 minute after reheat
capacity = 0% (0 Vdc).
• Every 24 hours, the reheat control valves will be driven to
their maximum position (10Vdc) and then returned to their
normal operating position (0Vdc). If unit is operating in
cooling or dehumidification (reheat) at the prescribed time
it will be deferred to the next time.
• Dehumidification status can now be found under the MTIII
main system menu. Reheat capacity (valve position)
can also be found under the main system menu, display
based on percentage (0-100%).
Figure 29: Modulating Hot Gas Reheat Schematic
www.DaikinApplied.com
35
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Hot Water Heat
Optional Hot Water Heat
Hot Water Heater Design
If the 8th digit of the model number is a “W”, the rooftop unit
was furnished with a factory installed hot water coil (Example:
MPS035FW). The hot water coil comes with a piping vestibule
for field supplied and installed control valve and piping. The
coil is furnished with ODM copper connections. The Maverick
commercial rooftop units are available with a low heat (one row
coil) or a high heat (two row coil) configuration.
See certified drawings for the recommended piping entrance
locations. Seal all piping penetrations to prevent air and water
leakage.
NOTE: Factory installed piping is copper. Dissimilar metal
within the plumbing system can cause galvanic
corrosion. To avoid corrosion, provide proper dielectric fittings as well as appropriate water treatment.
CAUTION
Coil freeze possible. Can damage equipment. Follow
instructions for mixing antifreeze solution. Some products
have higher freeze points in natural state than when mixed
with water. The freezing of coils is not the responsibility of
Daikin.
Figure 30: Hot Water Heating Schematic
Figure 31: Hot Water Heat Vestibule
Return
D
Unit
A
B
C
D
015–020
64.5
8.5
8.5
28.5
026–035
64.5
8.5
8.5
28.5
040–050
90.2
8.5
8.5
28.5
Condenser End
C
Supply
B
A
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
36
www.DaikinApplied.com
Optional Hot Water Heat
Hot Water Pressure Drop Data
Figure 32: MPS 015 – 017 Low and High Heat
Figure 33: MPS 020 Low and High Heat
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37
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Hot Water Heat
Figure 34: MPS 026 – 035 Low and High Heat
Figure 35: MPS 040 – 050 Low and High Heat
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
38
www.DaikinApplied.com
Optional Energy Recovery Wheel
Optional Energy Recovery Wheel
Energy Recovery Wheel Design
When a unit is equipped with an optional enthalpy wheel,
energy recovery is provided by drawing outside air across
half of the enthalpy wheel and drawing exhaust air across the
other half. Latent heat and sensible heat are transferred from
the hotter and moist exhaust air to the colder and dry outside
air during winter conditions. Latent heat and sensible heat
are transferred from the hotter and moist outside air to the
cooler and dry exhaust air during summer conditions. Energy
recovery control consists of starting and stopping an exhaust
fan, modulating the speed of the exhaust fan, starting and
stopping an enthalpy wheel, optionally controlling the speed of
the enthalpy wheel and opening and closing a set of bypass
dampers. The outdoor dampers are controlled in the normal
manner.
Arrangements
Three arrangements are offered for the enthalpy wheel:
1. Single enthalpy wheel with economizer and bypass (see
Figure 36). This arrangement is available for all units.
2. Single enthalpy wheel without economizer (100%
outdoor air unit) for airflow up to about 7000 CFM. This
arrangement is available on sizes 015 - 040C and 800 802C only.
Wheel Construction
Your Daikin enthalpy wheel is delivered completely assembled
and ready to run. The wheel is built to provide many years
of trouble free service following proper installation and
performance of the minimal maintenance requirements.
Definitions
The following are descriptions of various components related
to the enthalpy wheel construction (see Figure 36):
Bearing, external – The wheel and bearing rotate on the shaft,
no field lubrication is required.
Brush seal – The seal used for both the circumferential seal and
the inner seal in the cassettes. They are constructed of nylon
brush and configured to seal against the enthalpy wheel band in
the case of the circumferential seal, and against the wheel face in
the case of the inner seal. These seals are full contact seals, have
an integral clip, and they are clipped to the cassette face panel
cutout (concumferential) or to the (inner) post.
Exhaust air – The air stream that is exhausted to the outside.
Exhaust air is building return air that has been run through the
enthalpy wheel.
Heat wheel – Synonymous with an enthalpy wheel, energy
conservation wheel, or total energy recovery wheel. Some heat
wheels are sensible only wheels and should not be confused
with Daikin total energy recovery wheels.
Hub – The center support of an enthalpy wheel.
Latent energy – Latent energy, in the context of enthalpy
wheel discussions, is the work done by the wheel to transfer
moisture from one air stream to another. Latent work is
accompanied by humidity changes in the air streams.
Media – The chemical composite part of the enthalpy wheel
which actually performs the latent and sensible exchange.
Outdoor air – The air stream that is brought in from the
outside. Outdoor air becomes supply air after going through
the enthalpy wheel.
Purge – A small segment of supply air defined by the gap
between the inner seal on the outdoor air edge of the center
post and the supply air edge of the center post. The purge
angle is adjustable. The purge captures the small amount of
supply air captive in the enthalpy wheel when the wheel moves
from return to supply and routes it to return to minimize cross
contamination.
Return air – The air stream that is returned from the building.
Return air becomes exhaust air after going through the
enthalpy wheel.
Rotor – The part of an enthalpy wheel that performs the
energy exchange and consists of the wheel media, hub,
spokes and band.
Sensible heat – Sensible energy, in the context of enthalpy
wheel discussion, is the work done by the enthalpy wheel to
transfer heat from one air stream to another. Sensible work is
accompanied by temperature changes in the air stream.
Supply air – The air stream that is supplied to the building
space. Supply air is outdoor air that has been run through the
enthalpy wheel.
Cassette – The steel structure that houses the rotor. Cassettes
are of punched sheet metal panelized construction.
Enthalpy wheel – A generic name for an energy conservation
wheel. The term “enthalpy” refers to an air stream’s total
energy (temperature and humidity level).
www.DaikinApplied.com
39
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Energy Recovery Wheel
Figure 36: Wheel Construction (Side-by-Side)
(1) Currently, only the Over-Under configuration is offered on Daikin roof-top systems and air handlers.
Purge and Pressurization
Pressurization is critical to minimize crossover from exhaust
to Figure 37: Purge Detail supply and to allow the purge to
operate.
Figure 37: Purge and Pressurization
Outside Air at
Atmospheric Pressure
Any leakage must occur
from outside to Exhaust Air
due to pressure gradient
Figure 38: Purge Detail
Supply Air
OUTSIDE AIR
Adjust purge in this
direction to decrease
capacity and increase
purge
Adjustable Purge
(See Detail)
EXHAUST AIR
Exhaust Air
Plenum Exhaust Fan
draws a negative pressure
NOTE:
Maintain the pressure gradient to
prevent cross contamination from the
Exhaust to Outside Supply Air
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
40
www.DaikinApplied.com
Optional Energy Recovery Wheel
Drive Motor
Constant Speed Frost Prevention
The enthalpy wheel comes standard with a constant speed
drive motor which is prewired to turn in the proper direction.
When there is a threat of frost on the enthalpy wheel, the wheel
is jogged so that less enthalpy transfer occurs and frosting
of the wheel is avoided. Frosting can occur on the enthalpy
wheel when the exhaust air leaving the wheel is saturated. This
condition occurs when two lines intersect on a psychrometric
chart, and it does not occur when these two lines do not
intersect (see Figure 39).
Frost Protection Option
During extremely cold winter conditions, exhaust air stream To
circumvent this possiblity, Daikin offers three factory installed
frost protection options with the MicroTech III system.
Varible Speed Frost Prevention
Defrost ON/OFF Control (Standard)
With this method the enthalpy wheel is stopped periodically
for a defrost time duration when the outdoor air temperature is
below an outdoor frost temperature threshold setpoint.
Figure 39: Frost Prevention Psychrometric Chart
When there is a threat of frost on the enthalpy wheel, the
wheel is slowed down so that less enthalpy transfer occurs
and frosting of the wheel is avoided. Frosting can occur on
the enthalpy wheel when the exhaust air leaving the wheel is
saturated. This condition occurs when two lines intersect on
a psychrometric chart, and it does not occur when these two
lines do not intersect (see Figure 39).
Energy Recovery Exhaust Hoods
Units with the optional energy recovery section have one
or two (depending on model) exhaust hoods. Each hood is
shipped in three pieces, consisting of one top and tow sides.
Install exhaust hood over the barometric relief dampers by
installing tow sides first and then install the top.
Variable Speed Frequency Control
A variable frequency drive is included with the frost protection
option and it controls the speed of the enthalpy wheel. The
unit has also been programmed for the recommended range
of wheel speed operation. Typical wheel speed is 45 RPM, but
the programming can allow for wheel speeds above or below
45 RPM. Check all factory settings to make sure they are
consistent with the application.
Enthalpy wheel speed will be controlled by exhaust
temperature measurement.
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41
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Outdoor Air Monitor
Optional Outdoor Air Monitor
Thermal Dispersion Airflow Measurement Technology
Thermal dispersion technology relates the velocity of the air
to the power and rise in temperature of a heated element in a
moving airstream. A precise bead-in glass thermistor probes
the airflow rate and air temperature. Multiple sensing points are
used to produce an average velocity for true volumetric airflow
(CFM/LPS). Each individual sensor node is calibrated to NIST
traceable airflow standards at 16 points, resulting in a accuracy
of 2% of the reading.
Connecting to MicroTech III Controllers
Wiring
1. Connect analog control wires from the MicroTech III
Controller to the outdoor air monitor controller.
a. MicroTech III controller (X1 on the MCB or X11
on the EXP_D) to the controller's analog output
terminal 1.
Figure 40: Bead-in-Glass Thermistor
Thermistor material
designed for self-heat
applications is fused
to dumet wire leads
b. MicroTech III controller (M on the MCB or M on the
EXP_D) to the controller's analog output terminal
COM.
Thermistor aging
process ensures
long term stability
2. Power Wires (24 VAC) to the outdoor air monitor
controller.
a. 24VAC from the unit control panel to the controller
terminals L1 and L2.
Dumet wire ensures
hermetically sealed
glass encapsulation
Outdoor Air Monitor Controller Settings
Kynar® coated wires are
welded to dumet leads
1. Set Controller SW1 switch to Vdc.
Waterproof potting
compound protects
assembly from the
environment
2. Set power switch to ON.
Outdoor Air Monitor Controller Configuration/
Set Up
Figure 41: Bead-in-Glass Thermistor Probe
(see Appendix, Figure 97 on page 123 for navigating the
Controller keypad)
1. Set LCD1 U/M to "CFM"
2. Set AR1 (see Table 23)
Zero Power Thermistor
3. Set OUT1 U/M =CFM
4. Set OUT1 =0–10V
Approaching
Airstream
Heat transferred to
the airstream is
proportional to the
airflow rate
5. Set FSI (see Table 23)
Table 23: Settings by Cabinet Size
Unit size
Self-heated Thermistor
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
42
Economizer and
0–100%
0–30%
Area sq.ft. (AR1)
Full scale output
CFM (FS1)
Small cabinet
7.3
4.75
10,000
Medium cabinet
10.0
9.5
10,000
Large cabinet
14.5
10.0
10,000
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Optional Outdoor Air Monitor
Figure 42: MicroTech III Controller
Figure 43: Transmitter and Connector Detail
Transmitter
Connector
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43
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Outdoor Air Monitor
Changing the System of Units
The transmitter is provided with the system of units set to I-P.
To change to S.I., simultaneously press and release the “UP”
and “DOWN” arrow buttons during normal operation. “IP/SI
UNITS” will be indicated on the LCD display. Press “ENTER”
three times and use the “UP” and “DOWN” arrow buttons until
the system of units desired is indicated. Press the “ENTER”
button to select changes then press “ESC” twice to return to
the normal operating mode. See Appendix, Figure 97 on page
123.
Converting the Analog Output Signal
from FPM to CFM (MPS to LPS for SI
units scaling)
Last LCD Character Shown in Lower Case
(Probe Malfunction)
The transmitter is shipped from the factory with analog output
“OUTPUT 1” set to indicate velocity in FPM. To automatically
convert this analog velocity output to volumetric flow (CFM
or LPS), simply set the *OUT1 U/M from FPM (default) to
CFM in the Setup Menu (See Appendix, Figure 98 on page
124). If you wish to manually convert the velocity output to
volumetric flow (CFM or LPS), simply multiply the indicated
output velocity (in FPM or MPS) by the free area of the air flow
probe installation location (free area x 1000 for SI units when
area is calculated in square meters). For -P sensors, the total
free area is programmed into the probe at the factory and is
printed on the probe hang-tag. For -F and -B sensor probes,
determine the free area following installation in accordance
with the installation guidelines. Refer also to Tables 4 and 9 for
a complete listing of conversions for each of the analog outputs
of the transmitter.
If the last character of the flow rate units on the LCD display is
lower case (for example FPm or CFm), this indicates that an
improper/malfunctioning probe is connected to the transmitter.
NOTE: The full scale analog output (OUTPUT1 ) value
is determined by the FS1 setting within the
SETUP MENU.
LCD Display Notifications
Following a brief initialization at power up, the LCD display
automatically displays airflow and temperature as all upper
case (caps) characters. The display provides additional
information on system status and alarm conditions as follows:
All LCD Characters Shown in Lower Case
When all characters of the flow rate units are displayed in lower
case (for example cfm) the transmitter is operating in the Field
Calibration Wizard mode. Daikin users do not need to use this
function.
LCD Blinks ** LOW ALARM **, ** HIGH ALARM
** or ** TRBL ALARM**
The LCD will alternately flash to indicate an active alarm
condition for the type of alarm that has been set. The LCD
displays airflow/temperature readings between the alarm
notifications. Alarm will cease when the alarm is cleared.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
44
www.DaikinApplied.com
Optional Outdoor Air Monitor
Altitude Correction Adjustment
Adjusting The Digital Output Filter
The Altitude Correction Adjustment allows for correction of
airflow readings at the installed site altitude and more precise
readings regardless on installed altitude. Refer to the SETUP
MENUS of Figure 97 for the *ALT= menu item, and set this
vale to the installation altitude.
The digital output filter is useful for dampening signal
fluctuations resulting from transient wind gusts on outdoor
air intakes or excessive turbulence generated from duct
disturbances. The digital output filter range can be set between
0 (OFF) and 99%. Increasing the filter percentage limits the
allowable change of the output signal. To change the amount
of filtering, enter the Setup menu and set “*FILTER1={desired
value}” as shown in Figure 97.
IMPORTANT
Fluctuations in the airflow output signal are normal. Laboratory
research indicates that dampening true fluctuations will
result in poor control and a larger dead-band of operation.
Therefore, the use of the dampening filters in control devices
is not recommended. Warnings indicate potentially hazardous
situations, which can result in property damage, severe
personal injury, or death if not avoided.
www.DaikinApplied.com
45
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Optional Outdoor Air Monitor
Table 24: General Troubleshooting
Problem
Possible Cause
Remedy
Power switch not in the "ON" position.
Move the power switch to the "ON" position.
Improper supply voltage to the power input terminal
block.
Ensure that 24VAC power is connected to L1 and L2
of the POWER terminal block and that the voltage
with the power switch in the "ON" position is between
22.8 and 26.4 VAC.
Blown fuse.
Check power wiring. Ensure that multiple devices
wired on a single transformer are wired "in-phase".
Replace fuse only with a 1.5 amp, fast-acting fuse
after the problem has been identified and corrected.
No LCD display indication and the green Transmitter
Status LED (D3) on the main circuit board is flashing.
LCD contrast too low.
Turn “Contrast” potentiometer on the main circuit
board "clockwise".
The LCD display is scrambled or there is no LCD
display indication after touching the switches, LCD
display or circuit board.
Static electricity.
Touch an earth-grounded object, such as a duct, to
discharge static electricity then reset the power. Avoid
direct contact with the LCD display or circuit board.
The LCD display indicates "No Probes".
The power switch on the transmitter was moved to
the "ON" position before the sensor probes were
connected.
Reset 24VAC power by moving the power switch from
the "ON" to "OFF" position and then back to the "ON"
position.
The LCD display indicates "DiffSensor Type".
Sensor probes have been mismatched.
Transmitters must have the same sensor type
connected (GP1, GF1 or GB1 sensor probes).
The LCD display indicates "Too Many Sensors".
A probe with 5 or more sensors has been connected
to a 'Type B' transmitter with 4 receptacles.
Probes with 5 or more sensors are shipped with and
require a 'Type A' transmitter with 2 receptacles.
The last digit of the flow rate unit is displayed as a
lower case letter. (When the Field Calibration Wizard
is engaged, the last character of the flow rate units is
displayed as an upper case letter.
The sensor detection system has detected one or
more malfunctioning or missing sensors.
Check sensor probe cable connections. If sensor
probe connections look OK and match the number of
sensor probes indicated on each probe’s hang tag.
A probe with 5 or more sensors has been connected
to a 'Type B' transmitter with 4 receptacles.
Probes with 5 or more sensors are shipped with and
require a 'Type A' transmitter with 2 receptacles.
The green Transmitter Status LED (D3) on the main
circuit board is "ON" but not flashing.
The microprocessor is not running.
Reset 24VAC power by moving the power switch from
the "ON" to "OFF" position and then back to the "ON"
position.
The green Transmitter Status LED (D3) on the main
circuit board is flashing at 1-second intervals.
No problem, normal operation.
No remedy required.
The sensor detection system has detected one or
more malfunctioning or missing sensors.
Check sensor probe cable connections. If sensor
probe connections look OK and match the number of
sensor probes indicated on each probe's hang tag.
A probe with 5 or more sensors has been connected
to a 'Type B' transmitter with 4 receptacles.
Probes with 5 or more sensors are shipped with and
require a 'Type A' transmitter with 2 receptacles.
Sensors are sensitive and can measure very low air
velocities. If a reading is indicated, there is airflow
present where the airflow measuring station is
located.
Do not attempt to adjust zero ("offset"). Doing so will
result in an error in airflow measurement. The Low
Limit airflow cutoff value can be set to force the output
signal to zero.
Output card is not securely mounted on main circuit
board.
Turn the transmitter power "OFF", and then press the
output card firmly onto main circuit board. Turn the
transmitter power back "ON".
No LCD display indication and the green Transmitter
Status LED (D3) on the main circuit board is not
illuminated.
The green Transmitter Status LED (D3) on the main
circuit board is flashing at 2-second intervals.
The transmitter indicates airflow when the HVAC
system is not operating.
No output signal can be measured at the OUTPUT
terminal block of the transmitter.
Blown output fuse (output 1 and output 2 are fused
and protected independently on the transmitter).
Make sure that power has not been connected to
the output terminal block. Correct the problem and
replace with 0.125 amp, fast acting fuse only.
Make sure that the host control system is not
configured for a 2-wire device (no excitation voltage
should be present on the signals from the host
controls). Correct the problem and replace with 0.125
amp, fast acting fuse only.
The Low Limit airflow cutoff value is above the actual
airflow reading.
Decrease the Low Limit airflow cutoff value in the
Setup menu until it is below the actual airflow reading.
The output signal on the transmitter fluctuates while
the flow and/or temperature readings on the LCD are
steady.
Electrical interference from other devices is creating
noise in the signal wires to the host control system.
The output signal wiring must be shielded. Individually
ground one or more of the following points: the signal
wire shield at host controls; signal wire shield at the
transmitter, or L2 of the power terminal block of the
transmitter.
The LCD display does not match the readings
indicated by the host control system.
The scaling in the host control system is incorrect.
Compare the current configuration of the transmitter
with that of the host control system. Compare the
minimum and full scale settings for each output by
navigating through the Setup menu.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
46
www.DaikinApplied.com
Optional Outdoor Air Monitor
Table 25: Transmitter Troubleshooting
Problem
The host control system is unable to communicate
with the transmitter.
Possible Cause
Remedy
Output card is not securely mounted on main circuit
board.
Turn the transmitter power "OFF" and press the
output card firmly onto main circuit board. Turn the
transmitter power back "ON".
Network signal wiring is not properly connected to the
transmitter or the host controls.
Verify that the network signal wires from the host
controls are connected to the proper terminals of the
OUTPUT block. On the transmitter OUTPUT terminal
block, NET+ is for A, NET- is for B and COM for
common.
network protocol based on the network
Network protocol is not properly set on the transmitter. Set
requirements and reset transmitter power.
Set address based on network requirements and
Network address is not properly set on the transmitter. reset transmitter power. The address must be unique
for the network.
Network termination is not properly set on the
transmitter.
Set transmitter termination based on network
requirements and reset the transmitter power.
The LCD display does not match the readings
indicated by the host control system.
The Area or K factor of the transmitter does not match
that of the host controls.
Compare the value of the Area or K factor of the
transmitter with that of the host control system and
make adjustments to ensure a match.
The returned value for airflow is zero when airflow is
indicated on the LCD display of the transmitter.
The Low Limit airflow cutoff value is above the actual
airflow reading.
Decrease the Low Limit airflow cutoff value in the
Setup menu until it is below the actual airflow reading.
The sensor detection system has detected one or
more malfunctioning or missing sensors.
Check sensor probe cable connections. If sensor
probe connections look OK and match the number of
sensor probes indicated on each probe's hang tag.
A probe with 5 or more sensors has been connected
to a 'Type B' transmitter with 4 receptacles.
Probes with 5 or more sensors are shipped with and
require a 'Type A' transmitter with 2 receptacles.
The status point from the transmitter has a Trouble
value.
There is no value for the differential pressure point
www.DaikinApplied.com
Differential pressure is only available from transmitters If a differential pressure measurement is required,
that have a Bi-directional Bleed Airflow Sensors
contact your local Daikin Representative about a Biconnected.
directional Bleed Airflow Sensor.
47
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Unit Options
Unit Options
Economizer Enthalpy Control
The economizer can be ordered with the optional differential
enthalpy control. With this option a solid-state humidity and
temperature sensing device is located in the return and
outdoor airstreams. These devices are labeled RAE and OAE
respectively. When the outdoor enthalpy is lower than the return
air enthalpy, the economizer operation will be initiated. If the
outdoor air enthalpy is higher than the return air, the outdoor air
damper position will be at the minimum setpoint. See OM 920 for
further information on the economizer operation.
External Time Clock
You can use an external time clock as an alternative to (or in
addition to) the MicroTech III controller’s internal scheduling
function. The external timing mechanism is set up to open and
close the circuit between field terminals 101 and 102. When
the circuit is open, power is not supplied to binary input ID1.
This is the normal condition where the controller follows the
programmable internal schedule. When the circuit is closed,
power is fed to ID1. The MicroTech III controller responds
by placing the unit in the occupied mode, overriding any set
internal schedule.
Exhaust Fan Option
Economizer units may include exhaust fan options. For units
with CAV applications, the exhaust fans can be ordered as
staged control or they may be ordered with building pressure
control. The building pressure control option has a VFD that
runs the exhaust fan motors and is controlled by the static
pressure sensor number 2 (SPS2). Refer to OM 920 for setting
up the unit controller with these two options. The units are only
available with building pressure control on VAV units.
The exhaust fan motors are permanently lubricated and do not
require any additional periodic lubrication.
Figure 44: Pressure Tubing Diagram
TO ENTERING
AIR SIDE OF
THE FILTERS
PC5
HI
Proof-of-Airflow and Dirty Filter
Switch
The proof-of-airflow switch (PC7) and the dirty filter switch
(PC5) are supplied on all CAV units. The tubing is installed
to the switches per Figure 44. The proof of airflow switches
senses the pressure difference between the positive pressure
in the supply air fan compartment and the suction pressure on
the leaving air side of the filters. The differential pressure is
factory set at 0.25" for this switch. The dirty filter switch senses
the pressure difference across the filter; from the entering air
side of the filter to the leaving air side of the filters. The switch
is factory set at 1.0". When the pressure difference across the
filters is sensed at this value, the dirty filter alarm will appear
on the DDC controller.
All VAV units also have the PC7 and PC5 switches as standard
(see Figure 40). These switches are tied into the Duct High
Limit switch (DHL) as shown in Figure 44.
The DHL is factory set at 4.0". When this differential pressure
is sensed the normally closed contacts will open on the switch
giving the DHL alarm at the unit controller.
Duct High Pressure Limit
The duct high pressure limit control (DHL) is provided on all
VAV units. The DHL protects the duct work, terminal boxes,
and the unit from over pressurization, which could be caused
by, for example, tripped fire dampers or control failure.
The DHL control opens when the discharge plenum pressure
rises to 3.5" wc (872 Pa). This setting should be correct for
most applications and should not be adjusted.
If the DHL switch opens, digital input ID9 on the Unit Control
Board will be de-energized. The MicroTech III controller then
shuts down the unit and enters the Off-Alarm state. The alarm
must be manually cleared before the unit can start again.
Refer to the operation manual supplied with your unit for more
information on clearing alarms (refer to OM 920).
LO
TO LEAVING
AIR SIDE OF
THE FILTERS
HI
LO
HI
LO
DHL
PC7
TO SUPPLY
FAN PLENUM
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
48
www.DaikinApplied.com
Unit Options
Convenience Receptacle
(Field Powered)
Convenience Receptacle
(Unit Powered)
A Ground Fault Circuit Interrupter (GFCI) convenience
receptacle is provided in the main control box on all units. To
use this receptacle, connect a separate field-supplied 115 V
power wiring circuit to the outlet.
A Ground Fault Circuit Interrupter (GFCI) convenience
receptacle is provided in the main control box on all units. The
receptacle shall be powered by a factory installed and wired
120V, 20 amp power supply. The power supply shall be wired
to the line side of the unit's main disconnect, so the receptacle
is powered when the main unit disconnect is off. This option
shall include a GFI receptacle, transformer, and a branch
circuit disconnect. The electrical circuit shall be complete with
primary and secondary overload protection. See Figure 45 for
a branch circuit diagram.
460V LINE
VOLTAGE PRI.
Figure 45: Unit Powered GFCI Receptacle Schematic
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49
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Unit Options
Condenser Fan Operation for Variable Speed Compressor Low Ambient
Option
(MPS 040 and 050 Only)
Daikin’s head pressure control operates by modulating the
motor speed of one condenser fan on the VFD compressor
refrigeration circuit in response to the condenser pressure.
VFD compressor refrigerant circuit contains a solenoid valve
that blocks refrigerant flow to half of the condenser coil, which
effectively removes 50% of the condenser surface from the
circuit for low load/low ambient conditions.
Figure 46: R-410A Speedtrol
This option allows for mechanical cooling operation down to 0F
(-18C). The VFD option senses refrigerant head pressure and
varies the fan speed accordingly. When the pressure rises, the
SpeedTrol increases the speed of the fan, when the pressure
falls. SpeedTrol decreases the speed of the fan.
The VFD throttling range is 250 to 400 psig, fixed, with a
corresponding fan speed range of 10Hz to 60Hz. The fan
motor is a three-phase motor, identical to the unit voltage
(208V to 575V) and is controlled by a variable frequency
drive. The variable frequency drive receives a signal from a
pressure transducer and varies the speed of the condenser fan
accordingly.
The SpeedTrol arrangement for VFD compressors is also
employing “Start-Stop control by Speed reference Level” in
which the VFD will stop the condenser fan motor under certain
conditions. If the head pressure were to fall below 250 PSIG
with the condenser fan operating at minimum speed of 10Hz
(possibly due to a low ambient or high wind condition) the
VFD will shut down the condenser fan. The VFD will restart
the condenser fan at 20 Hz if head pressure rises to a level
above 250 PSIG. In addition to modulating fan speed, a
refrigerant solenoid valve is included in circuit #1. Operation of
the solenoid valve is based on head pressure. If the average
condensing pressure falls below 250 PSIG (83F sat) for 60
seconds, the condenser solenoid valve closes, effectively
removing 50% of the condensing surface. If the averaging
condensing pressure rises above 350 PSIG (105F sat) for 60
seconds, the condenser solenoid valve is opened, activating
the entire condenser surface. The solenoid valve is disabled
above an outdoor ambient of 80F. The solenoid valve is in a
normally open configuration.
Figure 47: Speedtrol Operating Characteristics (for
Variable Speed Inverter Compressor Units)
Figure 48: Speedtrol Operating Characteristics (for
Variable Speed Inverter Compressor Units with Start-Stop
Control)
Refer to Figure 46 for wiring schematics of SpeedTrol.
Refer to Figure 47 and Figure 48 for SpeedTrol operating
characteristics.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
50
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Unit Options
VFD Compressor Operation
When a MPS is equipped with the VFD compressor option
there are two refrigeration circuits, one VFD controlled
compressor with up to 3 fixed speed compressors depending
on unit model. The VFD compressor must always be the “lead”
circuit or first one on and last one off.
VFD compressor modulation is controlled by an analog signal
(0 – 10 Vdc) from the unit controller. Refer to Figure 101. The
minimum VFD compressor speed is 25 rps (1500 rpm) and the
maximum VFD compressor speed is 100 rps (6000 rpm), but
the minimum and maximum limits per unit may vary depending
on operating conditions and unit model size.
The VFD compressor is a 4 pole motor design that operates off
a frequency signal from the VFD between 50Hz and 200Hz.
At Start-up the VFD compressor will automatically ramp up to
50 rps for first 10 seconds for lubrication requirements.
Crankcase heating for VFD Compressor model VZH-088 is
performed by the VFD via DC-holding current through the
motor windings.
VFD compressor modulation is additionally monitored and
adjusted in order to maintain operation within the approved
compressor operating envelope.
If the VFD compressor were to become inoperative, any other
compressors on the VFD circuit will be disabled. The unit can
continue to operate on the remaining fixed speed compressors
of the non-VFD circuit until the unit can be serviced.
When the VFD compressor is at its maximum speed and
more capacity is required, a fixed speed compressor is started
while the VFD compressor is reduced to minimum speed at
which point it resumes modulating to maintain the discharge
temperature. When the VFD compressor is at its minimum
speed and less capacity is required, a fixed speed compressor
is turned off while the VFD compressor is increased to
maximum speed at which point it resumes modulating to
maintain discharge temperature.
Figure 49: VFD Compressor Modulation Signal
Table 26: VFD Compressor Modulation Ranges
VFD Modulation Range
VFD Max rps
MPS Unit Model
VFD Min rps/
VFD Min V
VFD and Fixed Comp(s) On
1 Fixed On
2 Fixed On
3 Fixed On
VFD1Max rps/
VFD1MaxV
VFD2Max rps/
VFD2MaxV
VFD3Max rps/
VFD3MaxV
VFD Comp Only
VFDMax rps/
VFDMaxV
OilBoostrps/
OilBoostV*
026
39 rps / 0 Vdc
60 rps / 4.0 V
55 rps / 4.0 V
NA
70 rps / 6.0 V
70 rps / 4.0 V
030
39 rps / 0 Vdc
100 rps / 8.7 V
80 rps / 7.3 V
NA
100 rps / 10.0 V
100 rps / 7.3 V
035
39 rps / 0 Vdc
100 rps / 8.7 V
80 rps / 7.3 V
NA
100 rps / 10.0 V
100 rps / 7.3 V
040
39 rps / 0 Vdc
85 rps / 8.0 V
85 rps / 8.0 V
80 rps/ 7.3 V
100 rps / 10.0 V
100 rps / 7.3 V
050
39 rps / 0 Vdc
85 rps / 8.0 V
85 rps / 8.0 V
80 rps/ 7.3 V
100 rps / 10.0 V
100 rps / 7.3 V
* High and Low Oil Boost are explained on page 52
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51
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Unit Options
VFD Compressor Control
Control of the VFD compressor is accomplished with a digital
output enable signal and a 0-10VDC analog modulating
control signal.
General VFD Compressor Start Sequence
On a call for VFD compressor operation the VFD enable
output is energized (on) and the 0-10VDC analog control
signal is set to 3.33VDC (50 rps) for 10 seconds. During this
10 second initial period the VFD compressor’s internal logic
ramps the compressor to 50 rps to insure compressor startup oil
lubrication. After 10 seconds the VFD compressor control signal
begins modulation to maintain the cooling discharge set point.
Dehumidification Transition During
Cooling State
When dehumidification operation becomes active while the
unit is in the Cooling operating state, The VFD compressor
is ramped to its maximum capacity. If the VFD capacity at
this point is already above 75% of its full modulation a fixed
compressor is also turned on. The compressors are held at this
capacity for 1 minute before normal modulation resumes, to
maintain leaving coil temperature (LCT).
• VFD compressor will load up completely before starting
any fixed speed compressors to achieve LCT of 45F
(default) with the VFD compressor option. LCT may be
set between 45F to 52F.
• If reheat signal is at 100% for 10 minutes and the unit is
unable to raise the DAT to desired point, the controller
will stage off 1 fixed compressor and modulate the VFD
compressor speed to achieve the DAT set point.
NOTE: In addition to enabling VFD compressor operation
the VFD enable output is used to energize the liquid
line drop solenoid on the VFD circuit. (Only for Low
Ambient Option)
Compressor Stage Up Transition
When the VFD compressor has been operating at maximum
capacity for the cooling stage time period and there is a call
for more cooling capacity the following transition sequence is
followed when staging up.
During each fixed compressor stage UP sequence, the VFD
compressor speed is reduced to its minimum, as a fixed speed
compressor is turned on. Note that the VFD compressor
speed range is extended for these staging points to assure
smooth transition and to minimize capacity gaps. Typically, the
VFD compressor is overdriven (higher speed than normal full
load rating speed) before staging up a fixed compressor. The
VFD is held at minimum speed for 30 seconds before normal
modulation resumes.
Compressor Stage Down Transition
When the VFD compressor has been operating at minimum
capacity for the cooling stage time period and there is a call
for less capacity the following transition sequence is followed
when staging down.
During each fixed speed compressor stage DOWN sequence,
the VFD compressor speed is increased to maximum speed
(which varies with unit size and number of operating fixed
compressors) as a fixed speed compressor is turned off. Note
that the VFD compressor speed range has been extended
for these staging points to assure smooth transition and to
minimize capacity gaps. Typically, the VFD compressor will be
overdriven (higher speed than normal full load rating speed)
when staging down a fixed compressor.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Oil Balance/Boost Operational Sequence
When a low oil level is indicated in the VFD compressor sump,
the unit switches to either an oil balance or oil boost state. The
VFD compressor speed is increased during these modes to
promote the return of refrigerant oil to the VFD compressor.
To avoid short cycling of the oil balance/boost sequence, no
action is taken until a low oil indication has been present for 5
consecutive run minutes.
The unit determines whether to enter the oil balance or oil
boost mode based on the running conditions when a low oil
indication is experienced. The balance mode is only used when
a VFD compressor is part of a tandem compressor set. The
balance mode is usually entered first, and is utilized to move
oil from the fixed speed compressor to the VFD compressor. If
this mode fails to resolve the low oil indication issue, the unit
will then go into the boost mode. The boost mode is utilized
to return oil from the refrigerant system to the compressors.
VFD compressors that are not part of a tandem compressor
arrangement will skip the balance mode and only utilize the
boost mode.
The balance mode will be entered if the VFD compressor is
part of a tandem compressor arrangement and the fixed speed
compressor is running, and there is a low oil indication. Upon
entering the oil balance mode the fixed speed compressor is
turned off and the VFD compressor speed is increased to the
oil boost value shown in Table 20. The VFD compressor runs
at this condition until the optical oil sensor verifies that oil is
present for 3 continuous minutes. Unit Controller default is set
for a 10 minute max balance.
52
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Unit Options
VFD Compressor Protection Unloading
Control
If the oil balance mode fails to resolve the low oil condition,
or the fixed speed compressor was not running when the low
oil indication occurred, or the VFD compressor was not part
of a tandemized compressor set, when the low oil indication
occurred, the unit will enter boost mode
There are several modulating control functions that adjust the
speed control range of the VFD compressor to protect it from
damage under abnormal operating conditions. The following
functions are provided by the unit controller
Upon entering oil boost mode, the VFD compressor speed is
increased to the oil boost value shown in Table 20. If the VFD
compressor is part of a tandem arrangement, the fixed speed
compressor is started as well. The VFD compressor runs
at this condition until the optical oil sensor verifies that oil is
present for 3 continuous minutes. Unit Controller default is set
for a 10 minute max boost.
• High Pressure Unloading Control
• High Discharge Line Temperature Unloading Control
• High/Low Discharge Superheat Control
During the oil balance/boost sequence the DAT temperature is
overridden to allow the VFD compressor to continue operating
until oil balance/boost sequence termination.
If one or more fixed speed compressors on the non VFD
compressor circuit is operating, and the fixed speed
compressor on the VFD compressor circuit was not already
running when entering the oil boost mode, one fixed speed
compressor on the non VFD compressor circuit will be turned
off to minimize the disturbance to the DAT.
High Pressure Unloading Control
The VFD compressor has an upper operating sat discharge
pressure limit of 575 PSIG. If the discharge pressure exceeds
575 PSIG, the compressor speed is reduced 1 rps every 10
seconds until the discharge pressure is at or below 575 psig.
If the discharge pressure does not drop below 575 PSIG with
the VFD compressor operating at minimum speed (30 rps), the
compressor is locked out on alarm.
Oil balance/boost sequences and durations are logged in the
unit controller.
In addition, when the VFD compressor is operating above a
sat discharge pressure of 525 PSIG, the VFD compressor
maximum speed is limited to 90 rps and the minimum speed is
limited to 30 rps.
If low oil indication does not clear, the VFD compressor will be
shut down and oil level will be monitored for an additional 15
minutes. If low oil indication still does not clear within these 15
minutes, the VFD compressor will be locked out on alarm.
The low oil problem is also generated and the VFD compressor
circuit is disabled if the oil boost sequence is initiated more
than 4 times in a 24 hour period. If the oil balance/boost
sequence successfully restores the VFD compressor oil level
the fixed compressor stage is returned to its pre-oil balance/
boost condition and normal compressor sequencing and
modulation resumes
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• Condenser Coil Splitter Valve Control (For Low Ambient
Option)
53
A high side pressure transducer is standard on the VFD circuit
allowing the discharge pressure of the refrigerant circuit to be
viewed at the unit controller display.
If the unit controller needs to reduce the compressor speed in
order to limit discharge pressure, the action is recorded in unit
controller event log section.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Unit Options
High Discharge Line Temperature Unloading
Control
A compressor discharge temperature sensor (Thermistor) is
installed on the VFD compressor as standard. The temperature
is used to measure discharge temperature and superheat
levels at the VFD compressor discharge.
If the compressor discharge temp reaches 250F, the VFD
compressor speed is reduced by 10 rps and monitored for
3 additional minutes. The unit controller will continue to
reduce VFD compressor speed by 10-rps increments until
the discharge temp drops below 250F. If the VFD compressor
discharge temp reaches 250F a warning will be logged in the
controller. If reduced compressor speed does not resolve the
issue, the VFD compressor is shut down and allowed to cool
for 30 minutes. The VFD compressor is then re-started and if
the discharge temperature cannot be held under 250F, the VFD
compressor is locked out. The root cause may be connected
to a number of issues (low charge, blocked condenser coil,
condenser fan failure, malfunctioning TEV, etc.) and service is
needed.
High Superheat
If the VFD compressor discharge superheat rises to 75F for 10
consecutive minutes, the VFD compressor speed is reduced
by 10 rps increments down to a 40 rps operating speed.
Superheat is monitored at each speed for 10 minutes and if
superheat remains above 75F, the VFD compressor speed is
decreased an additional 10 rps. When compressor discharge
superheat level is at 75F or below, the compressor speed is no
longer decreased. If speed correction resolves problem,
the unit controller will have logged that a speed correction was
needed for superheat in the event log. If decreasing speed
does not correct issue, the VFD compressor is locked out and
an alarm is logged in the unit controller.
Manual Control (with VFD Compressor)
For service and troubleshooting the unit controller has capability
to allow the VFD compressor to be operated manually. Refer to
the controller OM-920 for more detail.
The basic manual operations include the following:
• Start or Stop the VFD compressor
The VFD compressor discharge Temp has an upper limit of
275F. The VFD compressor will be shut down if discharge temp
reaches 275F.
• Modulate VFD compressor from 0 – 100% speed
• Ability to energize condenser coil splitter solenoids (Only
for low ambient option)
NOTE: The fixed speed compressor circuit does not contain
this feature.
Low/High Discharge Superheat
With the high side pressure transducer and discharge
thermistor, the unit controller is capable of monitoring the
variable speed compressor discharge superheat. This feature
protects the VFD compressor against flood back, undercharged
conditions, overcharged conditions, malfunctioning TEV,
etc. Typical compressor superheat range is 20F to 75F. The
discharge temperature of the VFD compressor can be viewed
at the unit controller display.
• Ability to initiate or terminate oil boost sequence
If an electrical issue with the VFD compressor is suspected,
the winding resistance can be checked at the motor terminals.
Table 27: VFD Compressor Winding Resistance
Compressor Model
Voltage
Winding Resistance
(Ohms)
VZH-088B-X
208-230V
0.03
VZH-088B-X
460V
0.10
VZH-088B-X
575V
0.10
Low Superheat
If the compressor discharge superheat falls below 20F for
15 consecutive run minutes, the VFD compressor speed is
increased by 5 rps increments up to a 60 rps operating speed.
Superheat is monitored at each speed for 10 minutes and if
superheat remains below 20F, the VFD compressor speed is
increased an additional 5 rps. When compressor discharge
superheat level is at 20F or above, the compressor speed is no
longer increased. If speed correction resolves problem, the unit
controller will have logged that a speed correction was needed
for superheat in the event log. If increasing speed does not
correct issue, the VFD compressor is locked out and an alarm
is logged in the unit controller.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
54
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Unit Options
Condenser Coil Splitter Solenoid Valve Control
(MPS 040 and 050 Only)
VFD Compressor Emergency Stop Control
If the VFD compressor enable output signal has been ON for
30 seconds and the controller fails to receive the VFD run
verification input, VFD Compressor Emergency Stop Control is
activated. When this function is active, VFD compressor enable
output will be turned OFF for 5 seconds and then turned
ON and ramp VFD compressor speed to 60Hz. If controller
receives a VFD run verification input, a log event is set on VFD
Emergency Stop Control. If controller fails to receive the VFD
run verification input after 3 attempts in 30 minutes, the VFD
compressor is locked out and the problem is logged.
Condenser coil splitting is avaialble only on VFD compressor
circuit of a unit with low ambinet option. This feature assists in
maintaining head pressure during low ambient/low modulating
operation. A solenoid valve on each circuit is controlled by a
digital output from the MicroTech III controller.
The coil splitter solenoid valve is controlled based on the
average discharge line pressure equivalent saturation
temperature determined from the corresponding discharge
pressure transducer monitored via an analog input to the
MicroTech III controller.
The splitter solenoid valve on each circuit is normally open
(digital output de-energized). The splitter valve on a circuit is
closed (energized) when that circuit’s saturation temperature
remains below 83.0°F (250 psig) continuously for 60 seconds
and the OAT is less than or equal to 80.0°F. The solenoid valve
is re-opened when the saturation temperature rises above
105.0°F (350 psig) continuously for 60 seconds and the OAT
rises above 80°F or when all the compressors on the circuit are
OFF.
If the average saturated discharge temp falls below 250 PSIG
(83F) for 60 seconds and condenser coil splitter solenoid coil
is energized (closed), the VFD compressor modulation rate is
increased until an average saturated discharge temp of 250
PSIG (83F) is achieved. This operation will raise the lower
modulation limit of the VFD compressor, but is needed to
keep the VFD compressor inside its operating envelope and
maintain head pressure for TEV control.
Once active the VFD Compressor Emergency Stop Control
function remains active until one of the conditions are met.
• VFD compressor enable output signal has been ON for
30 seconds and VFD compressor status Input is ON
• VFD compressor is OFF
If the controller fails to receive the VFD run verification input
after the VFD compressor enable output signal has been ON
for 30 seconds, the circuit is shut OFF on VFD Compressor
Emergency Stop Control alarm.
Whenever this protection function becomes active a VFD
Compressor Emergency Stop Control event is recorded in the
Event Log with date and time stamp. Whenever this protection
function returns to normal a VFD Compressor Emergency Stop
Control return to normal event is recorded in the Event Log
with date and time stamp.
When the condenser coil splitter is energized (closed) and the
VFD compressor discharge pressure is below 250 PSIG, the
VFD compressor speed is increased by 5rps increments every
30 seconds until the discharge pressure exceeds 250 PSIG.
When the VFD compressor reaches 250 PSIG, this speed
becomes the new minimum speed of the VFD compressor. As
the discharge pressure rises above 250 PSIG, the minimum
allowable compressor speed is decreased in 5 rps increments
every 30 seconds.
If the condenser coil splitter valve is closed and the VFD
compressor discharge remains below 250 PSIG for 15
minutes the circuit is locked out and an alarm is logged in the
unit controller.
If a speed correction was performed to increase the
compressor discharge pressure, there will be a record of the
action in the unit controller under the event log.
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55
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Unit Options
Variable Speed Scroll Compressor
WARNING
Figure 50: Compressor Nameplate Information
The compressor must only be used for its designed
purpose(s) and within its scope of application (refer to the
Operating Limits). Consult the Application Guidelines. Under
all circumstances, the EN378 (or other applicable local safety
regulations) requirements must be fulfilled.
Daikin units with variable speed inverter compressor are
engineered with fixed speed compressor(s) in such a way
that the unit delivers only the required energy to satisfy space
conditions and provides you with exceptional energy savings.
It improves comfort through precise temperature and humidity
control. Variable speed compressor enhances energy efficiency
and capable of providing unit capacity modulation down to 20%
and reduces compressor cycling and wear on compressor.
Daikin rooftop units with variable speed Inverter compressors
are provided with Internal Permanent Magnet (IPM) motors.
Compressors are designed to vary capacity by modulating
the speed of the scroll set. The speed ratio for the IPM motor
compressor is 4:1 (25 rps to 100 rps). Condenser fans staging
and an oil management/monitoring system are provided for
reliable operation. The VFD compressor will always be on the
“lead” circuit and will be the first one ON and last one OFF.
A.
Model number
B.
Serial number
C.
Refrigerant
D.
Supply voltage to CDS303 frequency converter
E.
Housing service pressure
F.
Factory charged lubrication
G.
Compressor frequency and MaxMust trip current
Figure 51: Compressor Components
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
56
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Unit Options
Oil Injection Control
Optical Oil Level Sensor
The VFD compressor contains an oil injection valve and
solenoid (SV11) as standard. The oil injection valve provides
lubrication to the scroll set under low speed/low refrigerant
velocity situations. The oil injection valve is a normally closed
valve. Below 50 rps (100 Hz) the valve is closed and directs oil
to the scroll set suction port. Above 50 rps (100 Hz) the solenoid
is bypassed and sends oil into sump. The oil injection valve/
solenoid is mounted directly on the compressor and is controlled
by the Compressor VFD (relay 1 output, terminals NO & Com).
The coil voltage for the oil injection solenoid is 24 Vac.
An optical oil sensor is used to monitor oil level in VFD
compressor sump. The sensor is mounted directly to a fitting
on the VFD compressor shell and can be removed without
having to depressurize/reclaim the refrigeration system.
Optical oil indication signal is sent to MTIII Expansion Module
‘C’ (terminals X3 & M). Normal oil indication will provide a
contact closure from relay R40. Relay R40 will de-energize
during low oil indication, removing signal to terminal X3 and
will start the unit in an oil boost sequence. Refer to Figure 54
and Figure 55
The coil can be removed if required by carefully prying off
the valve stem. The wiring connector is attached to the coil
by a screw in the center of the housing. Refer to Figure 52
and Figure 53.
Figure 54: Sightglass for Optical Oil Sensor/Switch
Figure 52: Assembly Components
Figure 55: Optical Oil Level Sensor/Switch
Electrical Connections and Wiring
Basic Connections
Figure 53: Oil Injection Control Dismanteling
Depending on the frequency converter version, the physical
position of individual connectors may differ. Always make sure
that the compressor terminals, U, V and W are connected to
the frequency converter terminals, 96, 97 and 98 respectively.
The compressor motor cable is shielded and the armoured
part of the cable is connected to a ground on both cable ends;
at the side of the compressor and at the side of the frequency
converter.
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57
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Unit Options
Variable Frequency Drive for VFD Compressor
WARNING
Never bypass the compressor drive or directly connect the
VFD compressor to the main power supply.
WARNING
The compressor drive is preset to run the compressor
clockwise.
WARNING
Variable Speed Inverter Compressor
The VFD is factory-programmed and should not be modified
in the field. Any modifications will void the warranty.
Compressors are compatible with the manufacturer’s VFD
only.
The compressor drive used for this option is a special series
(CDS 303) that is intended for use with an IPM compressor
motor and cannot be replaced with any off the shelf VFD.
Basic Operation of Compressor Drive:
Start= Connect terminals 12 & 18 for minimum of 5 secs,
connect terminals 12 &27 and terminals 13 &37
Stop= Disconnect terminals 12 & 27
Emergency Stop= Disconnect terminals 13 & 37
Control/Modulation= 0 to 10Vdc signal to terminals 53 & 55
Run Verification= A contact closure from relay 02 (terminals
04 & 05) is provided when drive is running
Oil Injection= A contact closure from relay 01 (terminals 01 &
02) is provided when compressor speed is greater than 50 rps
(3000 rpm) which energizes the oil solenoid coil.
The compressor drive contains protection for the compressor
against short circuits at the compressor terminals, overload
protection , phase loss and earth faults. The compressor drive
is protected against short-circuits.
Table 28: Compressor Drive Model & Frame Size
The compressor drive is mounted in the main control box.
The compressor drive and the LCP (local control panel) are
preset with parameters from the factory and should not need
to be changed in the field. The LCP is removable and is
interchangeable with any of the compressor drives used by
any of the VFD compressors. If the need arises to replace the
compressor drive, the parameters can be downloaded from the
LCP to the new compressor drive.
Compressor
Model
Drive Model
VZH-088B
Frame Size
208-230V
460V
CDS303-15kW
B4
B3
VZH-117B
CDS303-18kW
C3
B4
VZH-170B
CDS303-22kW
C3
B4
Refer to the VFD operational manual for more information.
The compressor drive is preset to run the compressor
clockwise and must be connected as shown in the unit
schematic.
The compressor drive is preset for an open loop configuration
with 0-10Vdc reference corresponding to 1500-6000 Rpm.
The compressor drive generates a soft start with an initial ramp
of 2 seconds. In-rush current (or LRA) to the VFD compressor
is typically not more than a few percent more than rated
nominal Current.
Compressor Speed, modulation signal %, frequency signal,
compressor amperage are all displayed in real time on the
compressor drive screen. Alarms and descriptions will also be
visible on the compressor drive screen.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
58
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Wiring Diagrams
Wiring Diagrams
Figure 56: VAV Power – Fixed Speed Scroll Compressor
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59
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Wiring Diagrams
Figure 56 continued: VAV Power – Fixed Speed Scroll Compressor
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
60
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Wiring Diagrams
Figure 57: MPS 026 VAV Power with Variable Speed Inverter Compressor
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61
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Wiring Diagrams
Figure 57 continued: MPS 026 VAV Power with Variable Speed Inverter Compressor
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
62
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Wiring Diagrams
Figure 58: MPS 030–050 VAV Power with Variable Speed Inverter Compressor
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63
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Wiring Diagrams
Figure 58 continued: MPS 030–050 VAV Power with Variable Speed Inverter Compressor
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
64
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Wiring Diagrams
Figure 59: VAV Control – Inputs
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65
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Wiring Diagrams
Figure 59 continued: VAV Control – Inputs
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
66
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Wiring Diagrams
Figure 60: MPS 026 VAV Control with Variable Speed Inverter Compressor
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67
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Wiring Diagrams
Figure 60 continued: MPS 026 VAV Control with Variable Speed Inverter Compressor
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
68
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Wiring Diagrams
Figure 61: MPS 026 with Variable Speed Inverter Compressor – without Low Ambient Option
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69
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Wiring Diagrams
Figure 62: MPS 030 – 050 VAV Control with Variable Speed Inverter Compressor
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
70
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Wiring Diagrams
Figure 62 continued: MPS 030 – 050 VAV Control with Variable Speed Inverter Compressor
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71
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Wiring Diagrams
Figure 63: MPS 040 – 050 with Variable Speed Inverter Compressor – with Low Ambient Option
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
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Wiring Diagrams
Figure 64: VAV Control – Outputs (Staged Gas Heat)
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73
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Wiring Diagrams
Figure 64 continued: VAV Control – Outputs (Staged Gas Heat)
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
74
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Wiring Diagrams
Figure 65: CAV Power
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75
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Wiring Diagrams
Figure 65 continued: CAV Power
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
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Wiring Diagrams
Figure 66: CAV Control – Inputs
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Wiring Diagrams
Figure 66 continued: CAV Control – Inputs
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
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Wiring Diagrams
Figure 67: CAV Control – Outputs (Staged Gas Heat)
Figure 68: VAV/CAV Control – Outputs (Modulating Gas Heat)
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79
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Wiring Diagrams
Figure 69: Electric Heat Option Power
Figure 70: Electric Heat Option – Outputs
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
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Wiring Diagrams
Figure 71: Energy Recovery
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Wiring Diagrams
Figure 71 continued: Energy Recovery
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Wiring Diagrams
Figure 72: Energy Recovery Main Control Board
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83
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Wiring Diagrams
Figure 72 continued: Energy Recovery Main Control Board
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Sequence of Operation
Sequence of Operation
Operating States
The transition from any operating state to another is graphically
represented in Figure 73.
Figure 73: State Diagram
Any Other State
The return temperature is typically used for VAV units and the
space temperature is typically used for CAV units.
The unit goes into the heating mode of operation when the
control temperature (return or space temperature) is below the
heating setpoint by more than ½ the deadband.
Example – If the heating setpoint is 68.0°F and the deadband
is 1.0°F, the unit will not go into the heating mode of operation
until the control temperature reaches 67.4°F.
Start Up
Recirculation
When this takes place, the heating mode of operation will
begin and the 1st stage of heating operation will start. The
next stage, up or down, will take place after 4 minutes. This
“4 minutes” is called the stage timer. The gas or electric
heat module will continue to stage up as long as the control
temperature is below the heating setpoint by more than ½
the heating setpoint deadband. The unit will stage down if the
maximum discharge air temperature of 120°F is reached. Gas
units with one gas valve have 2 stages of heating and units
with two gas valves have 4 stages of heating.
Heating
Fan Only
Mechanical
Cooling
The unit's heating mode of operation is controlled by the
control temperature and the heating setpoint temperature. The
unit goes into the heating mode of operation by analyzing the
control temperature.
The control temperature can be either the return temperature
or the space temperature.
OFF
Economizer
Heating
Minimum DAT
Minimum DAT
This control mode is designed to temper the air in the ductwork
when in heating mode. When the unit is in the “Fan Only” state
and the Discharge Air Temperature is less than the minimum
discharge air temperature limit, “Minimum DAT” control is
initiated. The unit will turn on minimum heat until the discharge
air temperature exceeds the limit.
Start Up
With a “start up” command from the “Off” State the unit will
default into the “Start Up” state of operation for 3 minutes.
During this time, the fan is off.
Recirculation
Next, the unit will transition into the “Recirculation” state of
operation for another 3 minutes. During this time, the outside
air damper will close and the fan will turn on, thereby mixing
the air in the ductwork and the space.
Fan Only
The outside air damper will modulate to the minimum position
and based upon the sensor inputs, the unit will go into one of
the four running states - “Heating,” “Cooling,” “Economizing,”
or “Minimum DAT.” If the control temperature is between its
setpoint and its dead band, the unit will remain in the “Fan
Only” state.
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Sequence of Operation
Mechanical Cooling
Constant Volume (Space Comfort
Controller)
The control temperature for a CAV unit is typically the space
temperature. A space temperature sensor must be field
installed into the occupied space and connected to the unit
controller.
The unit goes into the cooling mode of operation when the
control temperature (space temperature) is above the cooling
setpoint by more than ½ the deadband.
Example – the cooling setpoint is set to 70.0°F and the
deadband is 1.0°F, the unit will not go into the cooling mode of
operation until the space sensor reaches 70.6°F.
When this takes place, the cooling mode of operation will begin
and the 1st stage of compressor operation will start.
The unit controller will turn on the next stage of compressor
operation, or turn off a stage of compressor operation, to
maintain the cooling setpoint temperature within the deadband.
When a compressor stage turns on, the next compressor
stage, up or down, will not take place for the next 4 minutes.
This “4 minutes” is called the stage time. Reference the
“Cooling Setup” menu for the adjustable stage time value.
When a cooling stage is initiated no further operation will take
place within the stage timer limit. In the above example, the
unit will stage down or turn off the cooling mode of operation
when the cooling setpoint reaches 69.4°F.
The unit controller will turn on the next stage of compressor
operation, or turn off a stage of compressor operation, to
maintain the discharge air temperature setpoint within the
deadband. When a compressor stage turns on, the next
compressor stage up or down will not take place for the next 4
minutes. This “4 minutes” is called the stage timer.
When a cooling stage is initiated no further operation will
take place within the stage timer limit. Reference the Cooling
Setup menu for the adjustable stage time value. In the above
example, the unit will stage down or turn off the cooling mode
of operation when the return temperature reaches 69.4°F.
Economizer
When the economizer is enabled, the outside air temperature
is below the changeover setpoint, and the differential enthalpy
switch (if installed) is made, the economizer becomes the
first stage of cooling. It will modulate to control to either the
discharge air temperature (VAV) or space temperature (CV).
Every 4 minutes, the unit can then either add mechanical
cooling if the economizer is at 100% open, continue
economizing, or if the control temperature is satisfied, return to
minimum position and transition back to “Fan Only” mode.
If the enthalpy switch breaks or the outside air warms, the unit
will exit economizing and continue to mechanically cool while
returning to the minimum position for ventilation.
Variable Air Volume (Discharge Air
Controller)
The unit's cooling mode of operation is controlled by the
control temperature, the change-over temperature, and the
discharge air temperature. The unit goes into the cooling mode
of operation by analyzing the control temperature. The control
temperature for a VAV system is the return temperature.
The unit goes into the cooling mode of operation when
the control temperature (return temperature) is above the
changeover setpoint by more than ½ the deadband.
Example – If the change over temperature is 70.0°F and the
deadband is 1.0°F, the unit will not go into the cooling mode of
operation until the return temperature reaches 70.6°F.
When this takes place, the cooling mode of operation will begin
and the 1st stage of compressor operation will start.
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Check, Test, and Start Procedures
Check, Test, and Start Procedures
WARNING
Electric shock and moving machinery hazard. Can cause
severe equipment damage, personal injury, or death.
Disconnect and tag out all electrical power before servicing
this equipment.
All start-up and service work must be performed only by
trained, experienced technicians familiar with the hazards of
working on this type of equipment
Read and follow this manual: “MicroTech III Unit Controller”
(OM 920) before operating or servicing.
Bond the equipment frame to the building electrical ground
through grounding terminal or other approved means.
WARNING
Hazardous voltage. May cause severe injury or death.
Disconnect electric power before servicing equipment.
Servicing Control Panel
Components
Before Start-Up
1. Remove shipping bolt form fan spring.
2. Verify that the unit is completely and properly installed
with ductwork connected.
3. Verify that all construction debris is removed, and that
the filters are clean.
4. Verify that all electrical work is complete and properly
terminated.
5. Verify that all electrical connections in the unit control
panel are tight, and that the proper voltage is connected.
6. Verify all nameplate electrical data is compatible with the
power supply.
7. Verify the phase voltage imbalance is no greater than 2%.
8. Verify that gas piping is complete and leak tight.
Pre-Start of Unit
All units are completely run tested at the factory to promote
proper operation in the field. However, to ensure proper
operation once the unit is installed, the following check, test,
and start procedures must be performed to properly start the
unit. To obtain full warranty coverage, complete and sign the
check, test, and start form supplied with the unit and return it to
Daikin.
A representative of the owner or the operator of the equipment
should be present during start-up to receive instructions in the
operation, care, and ma enance of the unit.
9. Verify that the shutoff cock is installed ahead of the
furnace, and that all air has been bled from the gas lines.
10. Verify installation of gas flue and outside air vents.
11. Manually rotate all fans and verify that they rotate freely.
12. Verify that the belts are tight and the sheaves are aligned.
13. Verify that all setscrews and fasteners on the fan
assemblies are still tight. See Setscrews on page 105.
14. Verify that the evaporator condensate drain is trapped
and that the drain pan is level.
15. If unit is curb mounted, verify that the curb is properly
flashed to prevent water leakage.
16. Review the equipment and service literature, the
sequences of operation, and the wiring diagrams to
become familiar with the functions and purposes of the
controls and devices.
17. Determine which optional controls are included with the
unit.
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Check, Test, and Start Procedures
Power-Up
Compressor Start-Up
1. Close the unit disconnect switch.
2. Power should now be supplied to the control panel.
Fan Start-Up
1. Remove shipping bolt from fan spring if this has not
already been done.
2. Verify fan spring adjustment and that the fan assembly is
level. Adjust as necessary.
CAUTION
Low ambient temperature hazard. Can cause compressor
damage. Do not attempt to start up and check out the
refrigeration system when the outdoor air temperature is
below 20°F.
With the supply fan operational, prepare for compressor
operation.
1. Connect service g t has not lost its refrigerant
3. Verify all duct isolation dampers are open.
2. Verify These should operate for arting the compressors.
4. Place the unit into the “Fan Only” mode through the
keypad.
3. Verify that the condenser fan blades are positioned
properly (see Figure 74) and that the screws are tight.
The fan blade must be correctly positioned within its
orifice for proper airflow across the condenser coils.
5. The controller should enter the “Startup Initial” operating
state. If the fan does not run, check the manual motor
protectors or that the circuit breakers have not tripped.
4. Check the fan rotation.
6. Verify the rotation is correct.
Economizer Start-Up
Figure 74: Condenser Fan Blade Positioning
Fan Blade
1. Check whether the outdoor air is suitable for free cooling.
2. At the keypad, set the cooling setpoint low enough so the
controller calls for cooling.
Orifice
3. Place the unit into cooling mode through the keypad menu.
4. Observe the outdoor air dampers:
a. If the outdoor enthalpy is low, the control algorithm
should start to modulate the dampers open to
maintain the discharge air setpoint.
1.21"
b. If the outdoor enthalpy is high, the dampers should
maintain their minimum position.
NOTE: It may not be possible to check the economizer
operation in both low and high enthalpy states on the
same day. If this is the case, repeat this procedure on
another day when the opposite outdoor air enthalpy
conditions exist.
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Check, Test, and Start Procedures
Scroll Compressor Rotational Direction
Scroll compressors only compress in one rotational direction.
Three-phase compressors rotate in either direction depending
upon phasing of the power to L1, L2, and L3. Since there is
a 50/50 chance of connecting power to cause rotation in the
reverse direction, verify that the compressor rotates in the
proper direction after the system is installed. If the compressor
is rotating properly, suction pressure drops and discharge
pressure rises when the compressor is energized. If the
compressor is rotating in reverse, the sound level is louder and
current draw is reduced substantially. After several minutes of
operation, the compressor’s internal protector trips.
All three-phase compressors are wired the same internally.
Therefore, once the correct phasing is determined for a specific
system or installation, connecting properly phased power leads
to the same terminals should maintain proper rotation direction.
Perform the Following Procedure:
1. At the keypad, set the cooling setpoint low enough so
that the controller will call for cooling.
2. Verify that compressor #1 starts. If the compressor motor
hums but does not run, verify that it is getting threephase power.
3. The compressor should operate continuously while there
is a call for cooling. If the compressor cycles on and off
on its low pressure switch, perform the following:
a. Verify that the circuit is not short of refrigerant.
4. Verify that the condenser fans are cycling and rotating
properly (blowing air upward). When the compressor
starts, at least one condenser fan should also start.
5. Check the oil level in the compressor sightglass. If
low oil is observed, it is possible that liquid refrigerant
is returning to the compressor. Check the suction
superheat, see “Expansion Valve Superheat Adjustment”
below. It should be between 10°F (5.5°C) and 13°F
(7.2°C). See “Expansion Valve Superheat Adjustment”
below.
6. Verify that the condenser refrigerant subcooling at full
capacity is between 13°F and 20°F.
Checking Subcooling
Following are recommendations for checking subcooling:
1. Run unit until it reaches steady state. Close the unit
section doors. Running the unit with its doors open will
affect system operation.
2. Measure the discharge gas pressure at the compressor
discharge gauge port with an accurate gauge. Use this
pressure to determine the saturation temperature of the
refrigerant.
3. Measure liquid temperature accurately by attaching
a thermocouple to the liquid line tube leaving the
condenser coil. Insulate the tube and thermocouple for
more accurate results.
4. Subtract the measured liquid temperature from the
saturation temperature to determine the subcooling.
b. Check for low airflow across the evaporator coil.
5. As a general rule, high subcooling indicates that the
circuit is low on charge. Low subcooling generally
indicates that the circuit has too much charge.
c. Check for clogged filters.
d. Check for restricted ductwork.
e. Check for very low temperature return air entering
the unit.
NOTICE
f. Verify that the liquid line components, expansion
valve, and distributor tubes are feeding the
evaporator coil.
Venting refrigerant to atmosphere is not allowed per most
local laws and/or codes.
g. Verify that all air handling section panels are
closed.
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Check, Test, and Start Procedures
Expansion Valve Superheat Adjustment
Drive Belt Tension Adjustment
It is very important that the expansion valve superheat setting
be adjusted to be between 10°F (5.5°C) and 13°F (7.2°C).
Insufficient superheat will cause liquid floodback to the
compressor which may result in slugging. Excessive superheat
will reduce system capacity and shorten compressor life.
1. The ideal tension is the lowest tension at which the belt
will not slip under peak load conditions. Over tensioning
shortens belt and bearing life.
Turn the adjustment stem clockwise to increase superheat.
Not exceeding one turn, adjust the stem and then observe the
superheat. Allow up to 30 minutes for the system to rebalance
at the final superheat setting.
3. Keep belts free from foreign material which may cause
slippage.
2. Check tension frequently during the first 24–48 hours of
operation.
4. Make V-drive inspection on a periodic basis. Adjust
tension if the belt is slipping. Do not apply belt dressing.
This may damage the belt and cause early failure.
Checking Superheat
Following are recommendations for checking superheat:
1. Close the unit section doors. Running the unit with
its doors open will affect expansion valve and system
operation considerably.
Air Balancing
The following should be performed by a qualified air balancing
technician:
1. Check the operating balance with the economizer
dampers positioned for both full outdoor air and minimum
outdoor air.
2. Check the pressure and temperature at the suction
gauge port.
Sheave Alignment
2. Verify that the total rflow will never be less than that
required for operation of the electric heaters or gas
furnace.
1. Verify both motor and fan sheaves are in alignment
and the shafts are parallel. The center line of the motor
sheave must be in line with the center line of the fan
sheave. See Figure 75.
3. When the final drive adjustments or changes are
complete, check the current draw of the supply fan
motors. The amperage must not exceed the service
factor stamped on the motor nameplate.
2. Verify that all setscrews are torqued to the values shown
in Table 34 on page 105 before starting drive. Check
setscrew torque and belt tension after 24 hours of service.
Figure 75: Sheave Alignment (Adjustable Shown)
Must be
parallel
WARNING
Moving machinery hazard. Can cause severe personal
injury or death. Do not use a mechanically driven tachometer
to measure the speed return fans on this fan arrangement.
Use a strobe tachometer.
Rotating parts can cause severe personal injury or death.
Replace all belt/fan guards that are removed for service.
Bearing
Center lines
must coincide
Motor
Must be
parallel
Fixed Pitch
Sheave
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Check, Test, and Start Procedures
Energy Recovery Wheel
Prestartup Checks
Figure 76: Energy Recovery Wheel
1. By hand, turn wheel clockwise (as viewed from the pulley
side) to verify wheel turns freely through 360° rotation.
2. During rotation confirm wheel segments are fully
engaged in the wheel frame and segment retainers are
completely fastened
3. With hands and objects away from moving parts,
apply power and confirm wheel rotation. Wheel rotates
clockwise as viewed from the pulley side.
4. If wheel has difficulty starting, disconnect power and
inspect for excessive interference between the wheel
surface and each of the (4) diameter seals.
Diameter Seal Adjustment
1. Loosen diameter seal adjusting screws. See Figure 76.
2. Move adjustable diameter seals away from wheel.
3. Using a ¼ inch feeler gauge, adjust the diameter against
the wheel. See Figure 76.
4. Tighten diameter seal adjusting screws.
5. Apply power per the start up procedure.
WARNING
Keep hands away from rotating wheel! Contact with rotating
wheel can cause physical injury.
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Final Control Settings
Final Control Settings
Controller Settings for Normal Operation
When all start-up procedures are completed, set the controls
and program the MicroTech III controller for normal operation.
Use the following list as a guide; some items may not apply to
your unit.
1. Set the heating and cooling parameters as required for
normal unit operation:
Maintaining Control Parameter Records
Daikin recommends that the MicroTech III controller’s setpoints
and parameters be recorded and saved for future reference.
If the microprocessor control board requires replacement, this
record facilitates entering the unit’s proper
a. Temperature \ Zone Cooling \
b. Temperature \ Zone Heating \
c. Temperature \ Discharge Cooling \
2. Set the low ambient compressor lockout setpoint as
required. Do not set it below 20°F.
3. Set the high ambient heat lockout temperature setpoint.
4. Set the alarm limits as required.
5. Set the duct static pressure control parameters as required.
6. Set the building static pressure control parameters as
required.
7. Set the economizer control parameters as required.
8. Set the date and time in keypad menu.
9. Set the operating schedule as required using keypad
menus.
NOTE: Unit operation may also be controlled by the building
automation system.
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Maintenance
Maintenance
Performing Service Maintenance
Planned Maintenance
Installation and maintenance must be performed only by
qualified personnel who are experienced with this type of
equipment and familiar with local codes and regulations.
WARNING
Moving machinery and electrical power hazards. May
cause severe personal injury or death. Disconnect and lock
off all power before servi ng equipment.
CAUTION
Sharp edges are inh rent to sheet metal parts, screws,
clips, and similar items. May cause personal injury.
Exercise caution when servicing equipment.
Preventive maintenance is the best way to avoid unnecessary
expense and inconvenience. Have this system inspected at
regular intervals by a qualified service technician. The required
frequency of inspections depends upon the total operating time
and the indoor and outdoor environmental conditions. Routine
maintenance should cover the following items:
• Tighten all belts, wire connections, and setscrews.
• Clean the evaporator and condenser coils mechanically
or with cold water, if necessary. Usually any fouling is
only matted on the entering air face of the coil and can be
removed by brushing or vacuuming.
• Lubricate the motor and fan shaft bearings.
• Align or replace the belts as required.
IMPORTANT
Chilled Water Piping: A qualified Architect or Systems
HVAC Design Engineer familiar with piping design, local
codes and regulations, must provide piping design. The
following manufacturer recommendations serve as a general
guide and should not replace a qualified professional’s
piping system design.
• Clean or replace the filters as required.
NOTE: A partially full sight glass is not uncommon at part
load conditions. A varying amount of bubbles may be
noticeable in the sightglass, which is normal.
• Check for proper superheat.
• Check for blockage of the condensate drain. Clean the
condensate pan as needed.
• Check the power and control voltages.
IMPORTANT
Refrigerant Piping: A qualified Architect or Systems HVAC
Design Engineer familiar with refrigerant piping design, as
well as local codes and regulations, must provide refrigerant
piping design. The following manufacturer recommendations
serve as a general guide and should not replace a qualified
professional’s refrigerant piping system design.
• Check the running amperage of all motors.
• Check all operating temperatures and pressures.
• Check and adjust all temperature and pressure controls
as needed.
• Check and adjust all damper linkages as needed.
• Check the operation of all safety controls.
• Check the condenser fans and tighten their setscrews.
WARNING
Hazardous voltage. May cause severe injury or death.
Disconnect electric power before servicing equipment. More
than one disconnect may be required to de-energize the unit.
Servicing Control Panel Components
Disconnect all electric power to the unit when servicing control
panel components. Before servicing, always inspect units for
multiple disconnects to ensure all power is removed from the
control panel and its components.
All-Aluminum Condenser Coils
The condenser coils are an all-aluminum design including the
connections, micro-channels, fins (an oven brazing process
brazes the fins to the micro-channel flat tube), and headers
(Figure 77), which eliminates the possibility of corrosion
normally found between dissimilar metals of standard coils.
During the condensing process, refrigerant in the coil passes
through the micro-channel flat tubes, resulting in higher
efficiency heat transfer from the refrigerant to the airstream.
In the unlikely occurence of a coil leak, contact Daikin to
receive a replacement coil module.
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Maintenance
Figure 77: Micro-Channel Coil Cross-Section
Cleaning Option E Coated Coils
The following cleaning procedures are recommended as part
of the routine maintenance activities for Option E Coated Coils.
Documented routine cleaning of Option E Coated Coils is
required to maintain warranty coverage.
WARNING
Prior to cleaning the unit, turn off and lock out the main power
switch to the unit and open all access panels.
Remove Surface Loaded Fibers
Connecting the Condenser Coil to Copper
Tubing
Figure 78 shows the aluminum condenser coil connection
to the copper tubing in the unit. Because of the low melting
point of aluminum (1220°F compared to 1984°F for copper),
this brazed joint is performed with a low temperature brazing
process.
CAUTION
Potential equipment damage. If a standard copper brazing
process is performed at this joint, the process will damage the
aluminum connection. If a condenser coil ever needs to be
replaced, the copper aluminum joint repair should be done with
a ProBraze™ repair kit manufactured by OmniTechnologies
Corporation. A non-corrosive flux must also be used. The
brazing temperature should be between 850°F–900°F. If
a coil needs replacing, contact Daikin for a coil and copper
connection assembly.
Figure 78: Aluminum/Copper Connection
Surface loaded fibers or dirt should be removed prior to water
rinse to prevent further restriction of airflow. If unable to back
wash the side of the coil opposite that of the coils entering air
side, then surface loaded fibers or dirt should be removed with
a vacuum cleaner. If a vacuum cleaner is not available, a soft
non-metallic bristle brush may be used. In either case, the tool
should be applied in the direction of the fins. Coil surfaces can
be easily damaged (fin edges bent over) if the tool is applied
across the fins.
NOTE: Use of a water stream, such as a garden hose,
against a surface loaded coil will drive the fibers and
dirt into the coil. This will make cleaning efforts more
difficult. Surface loaded fibers must be completely
removed prior to using low velocity clean water rinse.
Periodic Clean Water Rinse
A monthly clean water rinse is recommended for coils that are
applied in coastal or industrial environments to help to remove
chlorides, dirt and debris. An elevated water temperature (not
to exceed 130ºF) will reduce surface tension, increasing the
ability to remove chlorides and dirt. Pressure washer PSI must
not exceed 900 psig and the nozzel should remain at leat 1 foot
from the coil to avoid damaging fin edges.
Routine Quarterly Cleaning of Option E Coated
Coil Surfaces
Quarterly cleaning is essential to extend the life of an Option
E Coated Coil and is required to maintain warranty coverage.
Coil cleaning shall be part of the unit’s regularly scheduled
maintenance procedures. Failure to clean an Option E Coated
Coil will void the warranty and may result in reduced efficiency
and durability in the environment.
For routine quarterly cleaning, first clean the coil with the
below approved coil cleaner (see approved products list under
Recommended Coil Cleaners section, Table 29). After cleaning
the coils with the approved cleaning agent, use the approved
chloride remover (under the Recommended Chloride Remover
section) to remove soluble salts and revitalize the unit.
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Maintenance
Recommended Coil Cleaner
Cautions
The following cleaning agent, assuming it is used in
accordance with the manufacturer’s directions on the container
for proper mixing and cleaning, has been approved for use
on Option E Coated Coils to remove mold, mildew, dust, soot,
greasy residue, lint and other particulate:
Harsh Chemical and Acid Cleaners
Table 29: Option E Coated Coil Recommended Cleaning
Agents
Cleaning Agent
Reseller
Part Number
Enviro-Coil Concentrate
Hydro-Balance Corp
P.O. Box 730
Prosper, TX 75078
800-527-5166
H-EC01
Enviro-Coil Concentrate
Home Depot
H-EC01
Chloride Remover
Chlor*Rid Int’l, Inc.
P.O. Box 908
Chandler AZ 85244
800-422-3217
Chlor*Rid DTS
Harsh chemicals, household bleach or acid cleaners should
not be used to clean outdoor or indoor Option E Coated
Coils. These cleaners can be very difficult to rinse out of the
coil and can accelerate corrosion and attack the Option E
coating. If there is dirt below the surface of the coil, use the
recommended coil cleaners as described above.
High Velocity Water or Compressed Air
High velocity water from a pressure washer or compressed air
should only be used at a very low pressure to prevent fin and/
or coil damages. The force of the water or air jet may bend the
fin edges and increase airside pressure drop. Reduced unit
performance or nuisance unit shutdowns may occur.
CHLOR*RID DTS™ should be used to remove soluble salts
from the Option E Coated Coil, but the directions must be
followed closely. This product is not intended for use as a
degreaser. Any grease or oil film should first be removed with
the approved cleaning agent.
1. Remove Barrier - Soluble salts adhere themselves
to the substrate. For the effective use of this product,
the product must be able to come in contact with the
salts. These salts may be beneath any soils, grease or
dirt; therefore, these barriers must be removed prior to
application of this product. As in all surface preparation,
the best work yields the best results.
2. Apply CHLOR*RID DTS - Apply CHLOR*RID DTS
directly onto the substrate. Sufficient product must be
applied uniformly across the substrate to thoroughly
wet out surface, with no areas missed. This may
be accomplished by use of a pump-up sprayer or
conventional spray gun. The method does not matter, as
long as the entire area to be cleaned is wetted. After the
substrate has been thoroughly wetted, the salts will be
soluble and is now only necessary to rinse them off.
3. Rinse - It is highly recommended that a hose be used,
as a pressure washer will damage the fins. The water to
be used for the rinse is recommended to be of potable
quality, though a lesser quality of water may be used if a
small amount of CHLOR*RID DTS is added. Check with
CHLOR*RID International, Inc. for recommendations on
lesser quality rinse water.
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Maintenance
Control Panel Components
The following individual motor protection is provided.
Table 30: Maverick Individual Motor Control and Protection
Motor Type
Short Circuit
Overload
ON-OFF
Compressor < 100
Amps
MMP
Internal
Contactor
Condenser Fans
MMP
Internal
Contactor
EAF, no VFD, 208-460V
MMP
MMP
Contactor
Other MMP Features:
• Three-position rotary operator: OFF (O)-TRIP-ON (I)
(Figure 79).
• Lockout—tagoutable rotary operator: turn the rotary
operator to OFF (O), slide out the extension arm, and
insert a lockout pin.
EAF, no VFD, 575V
CB
OL
Contactor
EAF with VFD
CB*
VFD
VFD
• Ambient compensated –20°C to +40°C.
SAF with VFD
CB*
VFD
VFD
SAF, no VFD
CB
OL
Contactor
• Single-phase sensitivity: if one phase exceeds setpoint,
all three phases open.
MMP = manual motor protector
Internal = vendor motor protector with internal sensors
CB = circuit breaker [* FB with MD4 VFD]
OL = over load relay
Manual Motor Protector (MMP)
• Trip test: insert a 9/64" screw driver in the test slot to
simulate a trip.
Figure 79: Manual Motor Protector
The manual motor protector (MMP) provides coordinated
branch circuit, short circuit protection, a disconnecting means,
a motor controller, and coordinated motor overload protection.
A short circuit indicator with manual reset is mounted along
side of each MMP as a means to differentiate between a short
circuit and overload trip conditions.
The MMP trip points are factory set. Do not change unless
the motor ampacity changes or the MMP is replaced with
a new device with incorrect setpoint adjustment. Any other
non-authorized trip point or setpoint adjustment voids all or
portions of the unit’s warranty. Authorized setpoint adjustment
is accomplished as follows
1. For motors with a 1.15 service factor, rotate the arrow on
the dial to correspond to the motor FLA.
2. For motors with a 1.0 service factor, multiply the
motor FLA by 0.9; then rotate the arrow on the dial to
correspond to that value.
To reset a tripped MMP, clear the trip by rotating the knob
counterclockwise to the OFF (O) position; then rotate knob
clockwise to the ON (I) position. See Figure 79.
WARNING
If an overload or a fault current interruption occurs, check
circuits to determine the cause of the interruption. If a fault
condition exits, examine the controller. If damaged, replace it
to reduce the risk of fire or electrical shock.
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
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Maintenance
Thermal Overload Relay
Circuit Breaker
Designed to provide current-dependent protection for loads
with normal starting against impermissibility high temperature
rises due to overload, phase asymmetry or phase failure.
Increase in motor current beyond set point as a result to
overload or phase failure will trip the overload and disconnect
the motor.
Circuit breakers are installed upstream of all VFDs to provide
short circuit protection. These breakers are not adjustable.
To reset a tripped circuit breaker: Clear the trip by rotating the
lever down to the OFF position. Then rotate lever up to the ON
position (see Figure 81).
The Relay trip points are factory set. Do not change unless
the motor ampacity changes or the Relay is replaced with
a new device with incorrect set point adjustment. Any other
non-authorized trip points or set points adjustment voids all or
portions of the unit’s warranty. Authorized set point adjustment
is accomplishment as follows:
1. For motors with 1.15 service factor, rotate the arrow on the
dial to correspond to the motor FLA (See Figure 80).
2. For motors with a 1.0 service factor, multiply the motor
FLA with 0.9; then rotate the arrow on the dial to
correspond to that value.
Breakers, like MMPs, have three distinct modes of operation
which are clearly indicated by the handle position. The
positions are ON (usually up, OFF (usually down), and
TRIPPED (midway). Some circuit breakers may have a pushto-test button.
CAUTION
If a circuit breaker has tripped due to an overload or a fault
current (short circuit), prior to resetting, the connected wiring
circuits must be checked to determine the cause of the
interruption.
To reset a tripped Relay, push the blue RESET button. To
disconnect, push the Red stop Button.
Reset After Tripping Information
Other Relay features:
If a breaker is tripped, the handle/lever will be halfway between
the OFF and ON positions. To reset a tripped circuit breaker:
• Three connection systems options, Screw type, spring
loaded and ring cable lug connection.
1. Press the handle or rotate the lever to the OFF position.
2. Press the handle or rotate the lever the opposite
direction to the ON position.
• Switch position indicator to indicate a trip and TEST
function for wiring.
• Large rotary button to adjust current to Motor RLA.
WARNING
• Selector switch for manual/and automatic RESET.
In certain applications the circuit breaker may be mounted
upside down. Therefore, when the handle is in the DOWN
position it may not be turned OFF. The handle position
corresponds to ON and OFF text clearly printed on the face
of the unit. Be sure the mounting orientation and desired
handle position is verified prior to performing service on the
equipment. Only qualified service personnel should work on
this equipment. Improper position of the breaker handle
during service may result in electric shock or death.
Figure 80: Overload Relay
Figure 81: Circuit Breaker
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97
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Maintenance
Field Wiring Terminals
Phase Voltage Monitor (PVM)
All field wiring terminals are spring clamp type, which offer
several advantages over traditional screw-type terminals:
The phase voltage monitor (Figure 83) is designed to protect
three-phase loads from damaging power conditions. A
microprocessor-based voltage and phase sensing circuit
constantly monitors the three-phase voltages to detect harmful
power line conditions. When a harmful condition is detected,
its output relay is deactivated after a specified trip delay (Trip
Delay). The output relay reactivates after power line conditions
return to an acceptable level for a specified amount of time
(Restart Delay). The trip and restart delays prevent nuisance
tripping due to rapidly fluctuating power line conditions.
• Spring connections do not require torquing
• Spring connections resist failure due to vibration
• Easily identifiable terminal markers
• Combination spring release and square test ports
Wire connections require inserting (“1” in Figure 82) a stripped
wire a round port and clamping the stripped wire by inserting a
flat-bladed screw driver in the adjacent square port (“2”).
Figure 82: Terminal Connectors
There are two LEDs on the face of the PVM (“1” in Figure 83)
to indicate the following items in Table 31.
Figure 83: Phase Voltage Monitor
Table 31: LED Indication
Status
LED Indicator
Normal operation, no faults, relay
energized
Green LED - steady on
Loss of input phase (relay
deenergized)
Red LED - flash twice, off, flash twice,
off, etc.
Voltage unbalance (relay deenergized)
Red LED - flash twice, off, flash twice,
off, etc.
High or low voltage (relay deenergized)
Red LED - steady on
Phase reversal (relay deenergized)
Red LED - pulse on, off, on, off, etc.
Restart delay (fault cleared, PVM
pending restart, relay de-energized)
Green LED - pulse on, off, on, off, etc.
Other features:
• Standard 2% to 8% variable voltage unbalance (“3” in
Figure 83).
• Standard 1 to 500 second variable restart delay (“2”).
• Standard 1 to 30 second trip delay (“4”) (except loss of
phase, which trips at 1 second non-adjustable).
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
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Maintenance
Unit Storage
Through-the-Door Disconnect
Opening the through-the-door disconnect without
performing a proper machine shut-down is not
recommended except in emergencies.
Location
The Maverick II is an outdoor unit. However, the construction
schedule may dictate storage either on the ground or in its
final position at the site. If the unit is stored on the ground,
additional precautions should be taken as follows:
The optional disconnect provides for locking out power to the
unit. To lock out power to the unit, rotate the habdle to the
“Reset/Lock” position and insert a padlock or locking device
through the base of the handle. Do not lockout the handle
with the Interlock in bypass mode.
• Make sure that the unit is well supported along the length
of the base rail.
DANGER
Hazardous voltage. May cause severe injury or death.
Disconnect electric power before servicing equipment. More
than one disconnect may be required to de-energize the unit.
CAUTION
Molded case switches do not provide over-current protection.
This device may automatically open the circuit at levels above
the ampere rating of the switch.
• Make sure that the unit is level (no twists or uneven
ground surface).
• Provide proper drainage around the unit to prevent
flooding of the equipment.
• Provide adequate protection from vandalism, mechanical
contact, etc.
• Make sure all doors are securely closed and all latches
closed.
• Units should be fitted with covers over the supply and
return air openings.
Preparation for Storage
Figure 84: Through-the-Door Handle Disconnect
Supply Fans
1. Remove the drive belts, tag them with the fan name and
unit serial number, and store them in a conditioned space
out of direct sunlight.
2. Once every two weeks, rotate the fan and motor shafts.
Mark the shaft positions first to make sure they stop in a
different position.
3. Depending on local climate conditions, condensate
may collect on components inside the units. To prevent
surface rust and discoloration, spray all bare metal parts
with a rust preventive compound. Pay close attention to
fan shafts, sheaves, bearings, and bearing supports.
Cabinet Sections
Once a month, open a door on each section and verify that no
moisture or debris is accumulating in the unit.
Control Compartment
1. Daikin recommends that the electronic control
equipment in the unit be stored in a 5% to 95% RH (noncondensing) environment.
2. It may be necessary to put a heat source (light bulb) in
the main control panel to prevent the accumulation of
atmospheric condensate within the panel. The location
and wattage of the heat source is dependent on local
environmental conditions.
3. Check the control compartment every two weeks
to confirm that the heat source is functional and is
adequatefor current conditions.
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99
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Maintenance
Restart
Vibration Levels
After extended storage, perform a complete start up. Inevitable
accumulations of dirt, insect nests, etc. can contribute to
problems if not cleaned out thoroughly prior to start up. In
addition, thermal cycling tends to loosen mechanical and
electrical connections. Following the startup procedure helps
discover these and other issues that may have developed
during the storage interval.
Each unit as shipped is trim balanced to operate smoothly. To
provide satisfactory operation after shipping and installation,
use accepted industry guidelines for field balancing fans.
NOTE: Excessive vibration from any cause contributes to
premature fan and motor bearing failure. Monitor overall
vibration levels every six months of operation. An
increase in levels is an indication of potential trouble.
Vibration Causes
Bearing Lubrication
1. Wheel imbalance.
a. Dirt or debris on wheel blades.
CAUTION
b. Loose setscrews in wheel hub or bearing-to-shaft.
Bearing overheating potential can damage the equipment.
Do not overlubricate bearings. Use only a high grade mineral
grease with a 200°F safe operating temperature.
c. Wheel distorted from overspeed.
2. Bent shaft.
Motor Bearings
3. Faulty drive.
a. Bad V-belts; lumpy, or mismatched.
Supply Fans
b. Belt tension too tight or too loose.
Supply fan motors should have grease added after every 2000
hours of operation. Use one of the greases shown in Table 32.
Using the following procedure, relubricate the bearings while
the motor is warm, but not running.
4. Bad bearings or loose bearing hold-down bolts.
5. Motor imbalance.
6. Fan section not supported evenly on foundation.
1. Remove and clean upper and lower grease plugs.
2. Insert a grease fitting into the upper hole and add a small
amount of clean grease with a low pressure gun.
Periodic Service and Maintenance
1. Check all moving parts for wear every six months.
3. Install the lower grease plug.
2. Check bearing collar, sheave, and wheel hub setscrews,
sheave capscrews, and bearing hold-down bolts for
tightness every six months.
4. Run the motor for five minutes before installing the upper
grease plug.
Condenser Fan and Exhaust Fan
The condenser fan and exhaust fan motors are permanently
lubricated and require no periodic lubrication.
Fan Shaft Bearings
Relubricate fan shaft bearings periodically. Relubricate
according to the schedule on the fan housing. If the bearings
are exposed to wet conditions, wide temperature variations,
or other severe atmospheric conditions, relubricate more
frequently. Use one of the greases shown in Table 32.
While the bearing is at normal operating temperatures, rotate
the fan by hand and add only enough grease to purge the
seals. The seals bleed slightly when this occurs. Do not
overlubricate.
Table 32: Recommended Greases
Manufacture
Product Name
Temp. Range (°F)
Texaco Lubricants Co.
Premium RB
-30 to 300
Mobil Oil Corporation
Mobilith AW2
-40 to 325
Shell Oil Company
Alvania No. 2
-20 to 240
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
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Maintenance
Energy Recovery Wheel
Drive Belts
CAUTION
Installation and maintenance must be performed only by
qualified personnel who are experienced with this type of
equipment and familiar w th local codes and regulations.
WARNING
Moving machinery and electrical power hazards. Can cause
severe personal injury or death. Disconnect and lock off all
power before servicing equipment.
CAUTION
Sharp edges are inherent to sheet metal parts, screws, clips,
and similar items. Contact with these edges may cause
personal injury. Exercise caution when servicing equipment.
DANGER
Hazardous voltage. Will cause severe injury or death.
Disconnect electric power before servicing equipment. More
than one disconnect may be required to de-energize the unit.
Servicing Control Panel Components
Disconnect all electric power to the unit when servicingcontrol
panel components. Before servicing, always inspectunits for
multiple disconnects to ensure all power is removedfrom the
control panel and its components.
Bearings
Enthalpy wheels are provided with "no maintenance" inboard
bearings, requiring no maintenance during the life of the
equipment.
Drive Motor
The wheel drive belt is a urethane stretch belt designed
to provide constant tension through the life of the belt. No
adjustment is required. Inspect the drive belt annually for
proper tracking and tension. A properly tensioned belt will turn
the wheel immediately after power is applied with no visible
slippage during start-up.
Belts are multilink with individual links constructed of a high
performance polyurethane elastomer, reinforced with multiple
plies of polyester fabric. This belt provides a strong, yet
flexible belting. The multilink feature provides easy servicing or
replacement.
Seals
The seals are designed to be durable and require no
maintenance other than adjustment. If seals become worn or
damaged they may easily be replaced. The seals are made to
clip onto the cassette or metal post easily.
Variable Frequency Controller
No maintenance should be required on the VFD. Should
problems with the VFD develop, consult the VFD service
manual that accompanied your order.
Wheel
The enthalpy wheel is designed to last the life of the
equipment. It is protected by an ASHRAE 30% filter to keep
dust and dirt from the heat transfer surface. The wheel is
somewhat self cleaning through its normal action of rotating
in and out of countercurrent air flow streams. If the wheel
becomes dirty, it may be cleaned by blowing out the unit with
compressed air (20 psig maximum). In cases of severe dirt,
the wheel may be removed from the cassette and washed with
water following wheel removable procedures outlined below.
The drive motor should require no maintenance. The wheel
drive motor bearings are pre-lubricated and no further
lubrication is necessary. The wheel drive pulley is secured to
the drive motor shaft by a combination of either a key or D slot
or setscrew. The set screw is secured with removable locktite
to prevent loosening. Annually confirm set screw is secure.
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101
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Maintenance
Routine Maintenance
Cleaning
Air Seals
The need for periodic cleaning of the energy recovery
wheel will be a function of operating schedule, climate and
contaminants in the indoor air being exhausted and the outdoor
air being supplied to the building.
Four adjustable diameter seals are provided on each cassette
to minimize transfer of air between the counter flowing
airstreams.
The Daikin wheel is “self-cleaning” with respect tiny particles
due to its laminar flow characteristics. Smaller particles pass
through; larger particles land on the surface and are blown
clear as the flow direction is reversed. Any material that builds
up on the face of the wheel can be removed with a brush or
vacuum.
The primary need for cleaning is to remove oil based
aerosols that have condensed on energy transfer surfaces.
A characteristic of all dry desiccants, such films can close off
micron sized pores at the surface of the desiccant material,
reducing the efficiency by which the desiccant can adsorb and
desorbs moisture and also build up so as to reduce airflow.
In a reasonably clean indoor environment such as school or
office building, measurable reductions of airflow or loss of
sensible (temperature) effectiveness may not occur for several
years. Measurable changes in latent energy (water vapor)
transfer can occur in shorter periods of time in applications
such as moderate occupant smoking or cooking facilities.
In applications experiencing unusually high levels of occupant
smoking or oil based aerosols such as industrial applications
involving the ventilation of machine shop areas for example,
annual washing of energy transfer may be necessary to
maintain latent transfer efficiency. Proper cleaning of the
energy recovery wheel will restore latent effectiveness to near
original performance.
To adjust diameter seals, loosen diameter seal adjusting
screws and back seals away from wheel surface (Figure 85).
Rotate wheel clockwise until two opposing spokes are hidden
behind the bearing support beam. Using a folded piece of
paper as a feeler gauge, position paper between the wheel
surface and diameter seals. Adjust seals towards wheel
surface until a slight friction on the feeler gauge (paper) is
detected when gauge is moved along the length of the spoke.
Retighten adjusting screws and recheck clearance with “feeler”
gauge.
Wheel Drive Components
The wheel drive motor bearings are prelubricated and no
further lubrication is necessary.
The wheel drive pulley is secured to the drive motor shaft by
a combination of either a key or D slot or setscrew. The set
screw is secured with removable locktite to prevent loosening.
Annually confirm set screw is secure.
The wheel drive belt is a urethane stretch belt designed
to provide constant tension through the life of the belt. No
adjustment is required. Inspect the drive belt annually for
proper tracking and tension. A properly tensioned belt will turn
the wheel immediately after power is applied with no visible
slippage during start-up.
Figure 85: Adjusting Diameter Seals
To clean, gain access to the energy recovery wheel and
remove segments. Brush foreign material from the face of the
wheel. Wash the segments or small wheels in a 5% solution
of non-acid based coil cleaner (such as Acti-Klean, available
through Daikin, Stock # AK1) or alkaline detergent and warm
water. Soak in the solution until grease and tar deposits are
loosened (Note: some staining of the desiccant may remain
and is not harmful to performance).
Before removing, rapidly run finger across surface of segment
to separate polymer strips for better cleaning action. Rinse
dirty solution from segment and remove excess water before
reinstalling in wheel.
CAUTION
Do not use acid based cleaners, aromatic solvents, steam
or temperatures in excess of 170ºF; damage to the wheel
may occur!
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
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Maintenance
Segment Installation &
Replacement
Figure 87: Installing Wheel Segments
Wheel segments are secured to the wheel frame by a Segment
Retainer which pivots on the wheel rim and is held in place by
a Segment Retaining Catch (Figure 86).
To install wheel segments follow steps 1 through 5 (Figure 87).
Reverse the procedure for segment removal.
1. Disconnect power to the drive motor.
2. Unlock two segment retainers. There is one on each side
of the selected segment opening.
3. With the embedded stiffener facing he motor side, insert
the node of the segment between hub plates.
4. Holding the segment by the two outer corners, press the
segment towards the center of the wheel and inwards
against the spoke flanges. If hand pressure does not
fully seat the segment, insert the flat tip of a screwdriver
between the wheel rim and outer corners of the segment
and apply downward force while guiding the segment
into place.
5. Close and latch each Segment Retainer under the
Segment Retaining Catch.
6. Slowly rotate the wheel 180°. Install the second segment
opposite the first for counter balance. Rotate the two
installed segments 90° to balance the wheel while the
third segment is installed. Rotate the wheel 180° again to
install the fourth segment opposite the third. Repeat this
sequence with the remaining four segments.
Figure 86: Segment Retaining Clip
Wheel Drive Motor & Pulley
Replacement
1. Disconnect power to the drive motor.
2. Remove belt from the pulley and positions temporarily
around the wheel rim.
3. Loosen the set screw in wheel drive pulley using Allen
wrench and remove pulley from the motor drive shaft.
4. While supporting the weight of the drive motor in one
hand, loosen and remove (4) mounting bolts
5. Install the replacement motor with hardware kit supplied.
6. Install the pulley per the dimensions in Figure 88 and
secure the set screw to the drive shaft
7. Stretch belt over pulley and engage grove.
8. Follow start up procedure on page 91 (procedure
needs to be confirmed).
Figure 88: Pulley Installation
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103
Series
DIM–A
36
1/4"
52
1/4"
64
7/16"
74
7/16"
86
7/16"
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Maintenance
Belt Replacement
1. Obtain access to the pulley side bearing access plate
and remove two retaining screws.
2. Using a hexagonal wrench, loosen the screw in the
bearing lock collar.
3. Using a light hammer and drift, tap collar in the direction of
wheel rotation to unlock collar. Remover collar.
Troubleshooting
The following table may be used as a quick-reference for
identifying common symptoms and possible causes related to
the recovery wheel.
Table 33: Energy Recovery Wheel Troubleshooting
Symptom
Cause
Check wheel rotation speed (see Variable Speed
Frequency Control on page 41).
4. Using a socket wrench with extension, remove two nuts
which secure bearing housing to the bearing support
beam.
Inadequate
Wheel
Performance
5. Slide bearing from shaft.
6. Using a wrench, remove the diameter seal retaining
screws. Remove diameter seals from bearing beam.
Check for wheel integrity and adjust seals or replace worn
seals (see Energy Recovery Wheel Design on page 39
and Seals on page 101).
Check entering air conditions and compare to design (see
“Energy Recovery Wheel” on page 67).
Check ducting for leakage and fix any leaks.
Check media for dirt and clean per cleaning instructions
(seeCleaning on page 102 and Segment Installation &
Replacement on page 103).
7. Form a small loop on the belt and pass it through the
hole in the bearing support beam. Grasp the belt at the
wheel hub and pull the entire belt down. Loop the trailing
edge of the belt over the shaft.
Check drive belts for engagement with sheave.
Improper
Wheel
Rotation
8. Install the new belt around the wheel and pulley.
9. Reinstall the bearing onto the wheel shaft, being careful
to engage the two locating pins into the holes in the
bearing support beam. Secure the bearing with two self
locking nuts.
High
Pressure
Drop
10. Reinstall the diameter seals and tighten retaining screws.
See Diameter Seal Adjustment on page 91.
Check drive motor.
Check drive motor wiring for proper voltage.
Check VFD programming (provided with optional frost
protection).
Check air flow and compare to design.
Check filters and clean/replace as necessary.
Check media for plugging and clean per cleaning
instructions (see Segment Installation & Replacement).
Check seals and adjust as necessary.
Noise
11. Reinstall bearing locking collar. Rotate collar by hand
in the direction the wheel rotates according to label on
wheel casset. Lock in position by tapping pin hole with
hammer and drift. Secure in position with set screw
Wheel Will Not
Operate
12. Reinstall bearing access cover with two screws
13. Apply power and ensure wheel rotated freely.
Check the bearings for source of noise.
Check the belt for slippage (see Drive Belt Tension
Adjustment on page 90).
Check all electrical connections. If MicroTech II controls
are provided, make sure the building pressure is above
setpoint such that the EAF turns on. The wheel does not
operate unless the EAF is on (see Exhaust Fan Option on
page 48).
Figure 89: Belt Replacement
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Maintenance
Supply Fan
Refrigerant Charge
Setscrews
The unit nameplate references proper charge for each refrigerant
circuit in case a full charge must be added to the unit.
Setscrews are used to lock bearings, sheaves, locking
collars, and fan wheels to their shafts. They must be checked
periodically to see that they have not loosened. If this is not
done, severe equipment damage could occur.
CAUTION
Severe loss of charge may occur if the high refrigerant
pressure switch is replaced before reclaiming the
refrigerant. Replace pressure switch after reclaiming
refrigerant. Venting refrigerant to atmosphere is not allowed
per most local laws and/or codes.
Refer to the values in Table 34 and check the tightness of all
setscrews with a torque wrench.
Table 34: Setscrew Minimum Torque Specifications
Setscrew Diameter (in.)
Minimum Torque (ft.lb)
1/4
5.5
5/16
10.5
3/8
19.0
7/16
29.0
1/2
42.0
5/8
92.0
Servicing Refrigerant Sensors or
Switches
The Maverick II includes the following refrigerant sensors or
switches.
1. Low refrigerant pressure sensing, operating switch,
automatic reset.
Supply Fan Wheel-to-Funnel Alignment
a. Disables associated compressors on a drop in
suction pressure to approximately 35 psig.
The fan wheel-to-funnel alignment must be as shown in Figure
90 to obtain proper air delivery and operating clearance. If
necessary, adjustments are made as follows:
b. Enables associated compressors on a rise in
suction pressure to approximately 60 psig.
1. Verify that the fan shaft has not moved in its bearings.
2. Loosen the fan hub setscrews and move the wheel(s)
along the shaft as necessary to obtain the correct
dimension shown in Table 35.
3. Retighten the setscrews to the torque specification given
in Table 34. Tighten the setscrews over the keyway first;
tighten those at 90 degrees to the keyway last.
4. Verify that the radial clearance around the fan is uniform.
Figure 90: SWSI Airfoil Wheel-to-Funnel Alignment
2. High refrigerant pressure, protective switch, manual reset
at keypad.
The low pressure switch senses refrigerant pressure through
shrader fittings that contain cores. The cores are stop valves
that do not allow refrigerant to flow through the Shrader unless
the device is in place. Therefore, the low pressure switch can
be replaced without reclaiming the refrigerant.
The Shrader that serves the high pressure switch does not
contain a core in order to maximize the functionality of the
safety. Therefore it cannot be replaced unless the refrigerant
has already been reclaimed.
Servicing Optional Electric Heater
WARNING
Hazardous voltage. May cause severe injury or death.
Disconnect electric power before servicing equipment. More
than one disconnect may be required to de-energize the unit.
If the electric heater is not operating properly, a qualified
electrician should perform the following to check if the heater is
damaged:
Table 35: SWSI Airfoil Wheel-to-Funnel Relationship
1. Measure continuity through all fuses.
Wheel-to-Funnel Relationship (in inches)
2. Check that all electrical connections are tight. Look for
signs of arcing.
Wheel Diameter
A
15
0.44
18
0.44
20
0.44
22
0.44
24
0.44
4. Check the resistance phase to phase for each circuit.
30
0.56
5. Check all contactors.
www.DaikinApplied.com
3. Check the resistance to ground for each circuit. It should
be infinite.
105
IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Service and Warranty Procedure
Service and Warranty Procedure
Replacement Parts
Replacement parts can be obtained by contacting Daikin
at 1-800-37-PARTS or at www.DaikinMcQuay.com. When
contacting Daikin for service or replacement parts, refer to the
model number and serial number of the unit as stamped on the
nameplate attached to the unit.
Order the replacement compressor through the Daikin Parts
Department (Minneapolis).
1. Contact the Daikin Parts Department for compressor
availability.
2. Send a completed parts order form to the Daikin Parts
Department.
When contacting Daikin for service or replacement parts,
provide the model number, serial number, and unit part
number of the unit as stamped on the serial plate attached
to the unit. For questions regarding wiring diagrams, provide
the number on the specific diagram. If replacement parts are
required, include the date of unit installation, the date of failure,
an explanation of the malfunction, and a description of the
replacement parts required.
3. The Parts Department processes the order and the
compressors are shipped from our Dayton, OH warehouse
via ground transportation. If next-day air is required,
indicate this on the parts order form and a freight charge will
be billed to your account. Air freight costs are not covered
under the Daikin warranty.
4. After the failed compressor is replaced, return it to Daikin
with a Return Goods Tag attached, which you will receive
in the mail. It must be attached to the compressor. The
Return Goods Tag has instructions on where to send the
compressor. If the compressor is not returned, you will be
billed for the replacement compressor.
Compressors
Scroll Compressor
All Daikin Rooftop products include a first-year parts only
warranty. The warranty period extends 12 months from startup
or 18 months from date of shipment, whichever comes first.
Labor to install these parts is not included with this warranty.
Compressors are considered a part and are included in this
standard warranty.
All Compressors
Replacement compressors for Daikin Rooftop Units can be
obtained from the Daikin Service Parts department.
The decision to replace the failed portion of the compressor
tandem, as opposed to replacing the entire tandem, must be
decided based on the following.
1. In warranty: Warranty only covers replacement of the
failed portion of the tandem.
2. Out of warranty: The customer decides whether to
replace the entire tandem or just a portion.
3. Some equipment may include the extended 2nd - 5th
year compressor warranty option.
5. Consideration may be given at this time to a compressor
teardown analysis, depending on the history of failures.
In-Warranty Return Material
Procedure
Material other than compressors may not be returned except
by permission of authorized factory service personnel of Daikin
at Minneapolis, Minnesota.
A “return goods” tag will be sent to be included with the
returned material. Enter the information as called for on the tag
in order to expedite handling at out factories and issuance of
credits. All parts shall be returned to the factory designated on
the return goods tag, transportation charges prepaid.
The return of the part does not constitute an order for
replacement. A purchase order for the replacement part
must be entered through your nearest Daikin representative.
The order should include the component's part number and
description and the model and serial numbers of the unit
involved.
If it is determined that the failure of the returned part is due to
faulty material or workmanship within the standard warranty
period, credit will be issued on the customer's purchase order.
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Warranty Registration Form
Warranty Registration Form
Rooftop
Equipment Warranty Registration Form
To comply with the terms of Daikin Applied Warranty, complete and return this form
within 10 days to the Warranty Department of Daikin Applied.
Check, test, and start procedure for Rooftop roof mounted air conditioners with or without heat
recovery and roof mounted air handlers.
GENERAL INFORMATION
Job Name: ____________________________________________________________
GOI No.: _______________________________
Installation address: _____________________________________________________________________________________________
City: _________________________________________________________________
State: _________________________________
Purchasing contractor: ___________________________________________________________________________________________
City: _________________________________________________________________
State: _________________________________
Name of person doing start-up: ____________________________________________________________________________________
Company name: ________________________________________________________________________________________________
Address: ______________________________________________________________________________________________________
City/State/Zip: __________________________________________________________________________________________________
UNIT INFORMATION
Unit model number: ____________________________________________________
Unit serial number: ______________________
Compressor 1 model number: ____________________________________________
Serial number: __________________________
Compressor 2 model number: ____________________________________________
Serial number: __________________________
Compressor 3 model number: ____________________________________________
Serial number: __________________________
Compressor 4 model number: ____________________________________________
Serial number: __________________________
Compressor 5 model number: ____________________________________________
Serial number: __________________________
Compressor 6 model number: ____________________________________________
Serial number: __________________________
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Warranty Registration Form
Rooftop Equipment Warranty Registration Form (continued)
Select Yes or No. If not applicable to the type of unit, select N/A.
I. INITIAL CHECK
A. Is any shipping damage visible? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
B. Are fan drives properly aligned and belts properly adjusted? . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
C. Tightened all setscrews on pulleys, bearings and fans? . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
D. Have the hold-down bolts been backed off on spring mounted fan isolators? . . . . . . . . . . . . . . . . . Yes
No
N/A
E. Do fans turn freely? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
F. Has the discharge static pressure reference line been properly located within the building? . . . . . . . . . Yes
No
N/A
G. Electrical service corresponds to unit nameplate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
Volts _____________ Hertz _____________ Phase _____________
H. Is the main disconnect adequately fused and are fuses installed? . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
I. Are crankcase heaters operating, and have they been operating 24 hours prior to start-up? . . . . . . . . . Yes
No
N/A
J. Are all electrical power connections tight? (Check compressorelectrical box.) . . . . . . . . . . . . . . . . Yes
No
N/A
K. Is the condensate drain trapped? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
No
N/A
II. FAN DATA
A. Check rotation of supply fan? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
B. Voltage at supply fan motor: . . . . . . . . . . . . . . . . 1–2_____________ V
2–3 _____________ V
C. Supply fan motor amp draw per phase: . . . . . . . . . . . . . . . L1 _____________
1–3 _____________ V
L2 _____________
L3 _____________
D. Fuse sizes: . . . . . . . . . . . . . . . . ._______________________________________________________________________
E. What is the supply fan rpm? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _____________
F. Check rotation of return fan?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
G. Voltage at return fan motor: . . . . . . . . . . . . . . . . 1–2_____________ V
2–3 _____________ V
H. Return fan motor amp draw per phase: . . . . . . . . . . . . . . . L1 _____________
No
N/A
1–3 _____________ V
L2 _____________
L3 _____________
I. Fuse sizes: . . . . . . . . . . . . . . . . ._______________________________________________________________________
J. What is the return fan rpm? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _____________
K. Record supply static pressure at unit in inches of H20: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _____________
L. Record return static pressure at unit (with outside air dampers closed) in inches of H20: . . . . . . . . . . . . . . . _____________
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Warranty Registration Form
Rooftop Equipment Warranty Registration Form (continued)
Select Yes or No. If not applicable to the type of unit, select N/A.
III. START-UP COMPRESSOR OPERATION
A. Do compressors have holding charges?
Circuit #1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
Circuit #2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
B. Are compressors rotating in the right direction? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
C. Do condenser fans rotate in the right direction? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
D. Ambient temperature (°F): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _____________
E. Does unit start up and perform per sequence of operation? . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
IV. PERFORMANCE DATA
A. Compressor voltage across each phase: . . . . . . . . . 1–2_____________ V
2–3 _____________ V
1–3 _____________ V
B. Compressor amperage of fully loaded compressor: Compressor #1 — Phase 1________
Phase 2 ________
Phase 3 _______
Compressor #2 — Phase 1________
Phase 2 ________
Phase 3 _______
Compressor #3 — Phase 1________
Phase 2 ________
Phase 3 _______
Compressor #4 — Phase 1________
Phase 2 ________
Phase 3 _______
Compressor #5 — Phase 1________
Phase 2 ________
Phase 3 _______
Compressor #6 — Phase 1________
Phase 2 ________
Phase 3 _______
C. Low pressure cut-out: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Circuit 1 __________ psig
Circuit 2 __________ psig
D. Low pressure cut-in: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Circuit 1 __________ psig
Circuit 2 __________ psig
E. High pressure cut-out: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Circuit 1 __________ psig
Circuit 2 __________ psig
F. Discharge pressure, one compressor: . . . . . . . . . . . . . . . . . . . . . Circuit 1 __________ psig
Circuit 2 __________ psig
G. Discharge pressure, fully loaded, 2–3 compressors: . . . . . . . . . . . . . Circuit 1 __________ psig
Circuit 2 __________ psig
H. Suction pressure, one compressor: . . . . . . . . . . . . . . . . . . . . . . Circuit 1 __________ psig
Circuit 2 __________ psig
I. Suction pressure, fully loaded, 2–3 compressors: . . . . . . . . . . . . . . . Circuit 1 __________ psig
Circuit 2 __________ psig
J. Liquid press, fully loaded, 2–3 compressors (at liquid line shutoff valve): . . . Circuit 1 __________ psig
Circuit 2 __________ psig
K. Liquid temperature, fully loaded, 2–3 compressors: . . . . . . . . . . . . . . Circuit 1 __________ psig
Circuit 2 __________ psig
L. Suction line temperature: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ____________ °F
____________°F
M. Superheat: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ____________ °F
____________°F
N. Subcooling:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ____________ °F
____________°F
O. Is the liquid in the line sightglass clear and dry? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
P. Does the hot gas bypass valve function properly?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Warranty Registration Form
Rooftop Equipment Warranty Registration Form (continued)
Select Yes or No. If not applicable to the type of unit, select N/A.
Q. At what suction pressure does the hot gas bypass valve open? . . . . . . . . . . . . _______ psig
_______ psig
______ psig
R. Record discharge air temperature at discharge of unit: ___________ °F
S. Are all control lines secure to prevent excessive vibration and wear? . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
T. Are all gauges shut off and valve caps and packings tight after start-up? . . . . . . . . . . . . . . . . . . . Yes
No
N/A
No
N/A
V. ELECTRIC HEAT CHECK, TEST & START
A. Electrical heat service corresponds tounit nameplate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
Volts _____________ Hertz _____________ Phase _____________
B. Are there any signs of physical damage to the electric heat coils? . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
C. Have all electrical terminals been tightened? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
No
N/A
D. Does sequence controller stage contactors properly? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
E. Electric heater voltage across each phase: . . . . . . . . . . . . . . . . . ___________ L1
___________ L2
___________ L3
F. Amp draw across each phase at each heating stage:
Stage 1
Phase L1: ___________
Phase L2: ___________
Phase L3 ___________
Stage 2
____________
____________
____________
Stage 3
____________
____________
____________
Stage 4
___________
___________
___________
Stage 5
___________
___________
___________
G. FLA: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . L1 ___________
Stage 6
____________
____________
____________
L2____________
H. Operate electric heat with fans off. Electric heat must cycle on high limit control . . . . . . . . . . . . . . . Yes
L3 ___________
No
N/A
VI. GAS BURNER CHECK, TEST, & START
Specifications:
For gas, see Forced Draft Gas Burner Installation and Maintenance Bulletin. (IM 684 and IM 685)
A. Gas Furnace:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Model no. __________________
B. Gas Burner: . . . . . . . . . . . . . . . . . . . . . . . . . . .Model no.___________________ Serial no. ___________________
C. Gas Rated firing rate (MBH input): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ._________________
D. Gas Altitude (ft. above sea level): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ._________________
E. Input (CFH): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _________________
F. Gas pressure at burner (inches w.c.): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _________________
G. CO2 (%) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _________________
H. CO2 (%): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _________________
I. Pilot flame only in microamps (steady at low fire): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _________________
J. Pilot Tap-gas pressure (inches w.c.): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _________________
K. Motor only/burner FLA running amps: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _________________
L. High limit control OK? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
M. Flame safeguard (microamps): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _________________
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Warranty Registration Form
Rooftop Equipment Warranty Registration Form (continued)
Select Yes or No. If not applicable to the type of unit, select N/A.
N. Flame failure shutoff (seconds): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _________________
O. Airswitch OK? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
P. High Gas Pressure Switch OK? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
Q. Low Gas Pressure Switch OK? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
R. Main Gas Valve Close-off OK?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
No
N/A
A. Heat wheel rotates freely? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
B. Heat wheel VFD operates properly? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
VII. Hot Water Coil
A. Pressure test OK? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
VIII. Heat Recovery
C. Heat wheel VFD . . . . . . . . . . . . . . Model No. _________________________ Serial No. ___________________________
D. Check for air bypass around heat wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
A. Verify power is supplied to the MicroTech III unit controller . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
B. Verify that the shipping screws have been removed from the measuring station vane . . . . . . . . . . . . Yes
No
N/A
C. Examine station for damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
IX. Design Flow Calibration
D. Record Level Position after calibration
• LH Level Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ____________
• RH Level Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ____________
NOTE: This is viewed in the MicroTech III controller, in the Min OA setup menu.
X.
Have all electronic or electrical controls been checked, adjusted, and tested for proper operation per the installation and
maintenance bulletins?
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
XI. MAINTAINING MICROTECH CONTROL PARAMETER RECORDS
After the unit is checked, tested, and started and the final control parameters are set, record the final settings. Keep these records
on file and update whenever changes to the control parameters are made. Keeping a record facilitates any required analysis and
troubleshooting of the system operation and facilitates restoration after a controller replacement.
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IM 1058-6 • MAVERICK II ROOFTOP SYSTEMS
Warranty Registration Form
Rooftop Equipment Warranty Registration Form (continued)
Select Yes or No. If not applicable to the type of unit, select N/A.
Thank you for completing this form. Please sign and date below.
Signature _____________________________________________________________
Startup date: ___________________________
Return completed form by mail to:
Daikin Warranty Department, 13600 Industrial Park Boulevard, Minneapolis, MN 55441
or by email to: AAH.Wty_WAR_forms@daikinapplied.com
Please fill out the Daikin Applied “Quality Assurance Survey Report” and list any additional comments that could affect the operation of this unit; e.g., shipping damage, failed
components, adverse installation applications, etc. If additional comment space is needed, write the comment(s) on a separate sheet, attach it to the Survey Report and return it to
the Warranty Department of Daikin Applied with the completed Equipment Warranty Registration form.
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Quality Assurance Survey Report
Quality Assurance Survey Report
Quality Assurance Survey Report
To whom it may concern:
Please review the items below upon receiving and installing our product. Mark N/A on any item that does not apply to the product.
Job Name: _____________________________________________________________________
Daikin Applied G.O. No. ______________
Installation address:____________________________________________________________________________________________________
City: ___________________________________________________________________________ State: _______________________________
Purchasing contractor:__________________________________________________________________________________________________
City: ___________________________________________________________________________ State: _______________________________
Name of person doing start-up (print): ___________________________________________________________________________________
Company name: ______________________________________________________________________________________
Address: ____________________________________________________________________________________________
City/State/Zip: _______________________________________________________________________________________
1. Is there any shipping damage visible? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
Location on unit ____________________________________________________________________________________
2. How would you rate the overall appearance of the product; i.e., paint, fin damage, etc.?
Excellent
Good
Fair
Poor
3. Did all sections of the unit fit together properly? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
4. Did the cabinet have any air leakage? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
No
N/A
No
N/A
No
N/A
No
N/A
No
N/A
Location on unit ___________________________________________________________________________________
5. Were there any refrigerant leaks? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
From where did it occur? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping
Workmanship
Design
6. Does the refrigerant piping have excessive vibration? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
Location on unit ___________________________________________________________________________________
7. Did all of the electrical controls function at start-up? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
Comments _______________________________________________________________________________________
8. Did the labeling and schematics provide adequate information? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes
9. How would you rate the serviceability of the product?
Excellent
Good
Fair
Poor
Excellent
Good
Fair
Poor
Excellent
Good
Fair
Poor
10. How would you rate the overall quality of the product?
11. How does the quality of Daikin Applied products rank in relation to competitive products?
Comments _______________________________________________________________________________________
Please list any additional comments which could affect the operation of this unit; i.e., shipping damage, failed components, adverse installation
applications, etc. If additional comment space is needed, write the comment(s) on a separate sheet, attach the sheet to this completed Quality
Assurance Survey Report, and return it to the Warranty Department with the completed preceding “Equipment Warranty Registration Form”.
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